Spells you control can't be countered. At the beginning of your end step, discover 5. (Exile cards from the top of your library until you exile a nonland card with mana value 5 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Imprint — Whenever a player casts an instant or sorcery spell from their hand, exile it instead of putting it into a graveyard as it resolves. At the beginning of your upkeep, if there are four or more cards exiled with River Song's Diary, choose one of them at random. You may cast it without paying its mana cost.

Flash Whenever an opponent searches their library, you gain 1 life and draw a card.

Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays {X}, where X is Esper Sentinel's power.

Whenever an opponent draws a card, you may pay {1}. If you do, draw a card.

You may look at the top card of your library any time. You may cast artifact spells and colorless spells from the top of your library. {T}, Pay 1 life: Exile the top card of your library.

{1}: Look at the top three cards of your library, then put them back in any order. {T}: Draw a card, then put Sensei's Divining Top on top of its owner's library.

All creatures gain hexproof and indestructible until end of turn. Players gain hexproof until end of turn. Players can't lose life this turn and players can't lose the game or win the game this turn.

Kicker {2}{W} (You may pay an additional {2}{W} as you cast this spell.) Target creature phases out. If this spell was kicked, each creature target player controls phases out instead. (Treat phased-out creatures and anything attached to them as though they don't exist until their controller's next turn.)

{T}: Add {C}{C}. Ancient Tomb deals 2 damage to you.

{T}: Add {C}. {3}, {T}: Draw a card. Activate only if you control a creature with power 4 or greater.

{T}: Add {C}. {2}, {T}, Sacrifice Buried Ruin: Return target artifact card from your graveyard to your hand.

Castle Ardenvale enters the battlefield tapped unless you control a Plains. {T}: Add {W}. {2}{W}{W}, {T}: Create a 1/1 white Human creature token.

As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.

{T}: Add {C}. {2}, {T}, Sacrifice Demolition Field: Destroy target nonbasic land an opponent controls. That land's controller may search their library for a basic land card, put it onto the battlefield, then shuffle. You may search your library for a basic land card, put it onto the battlefield, then shuffle.

{T}: Add {W}. Channel — {2}{W}, Discard Eiganjo, Seat of the Empire: It deals 4 damage to target attacking or blocking creature. This ability costs {1} less to activate for each legendary creature you control.

{T}: Add {C}. {1}, {T}, Sacrifice Emergence Zone: You may cast spells this turn as though they had flash.

Emeria, the Sky Ruin enters the battlefield tapped. At the beginning of your upkeep, if you control seven or more Plains, you may return target creature card from your graveyard to the battlefield. {T}: Add {W}.

{T}: Add {W}. When Flagstones of Trokair is put into a graveyard from the battlefield, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle.

{T}: Add {C}. {T}, Sacrifice Ghost Quarter: Destroy target land. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle.

{T}: Add {C}. {1}{W}, {T}: Put target enchantment card from your graveyard on top of your library.

{T}: Add {C}. {T}, Sacrifice a creature: You gain 1 life.

At the beginning of your upkeep, if you control three or more artifacts, you gain 1 life. {T}: Add {C}. {4}, {T}, Sacrifice Inventors' Fair: Search your library for an artifact card, reveal it, put it into your hand, then shuffle. Activate only if you control three or more artifacts.

{T}: Add {C}. {1}{W}, {T}: Prevent all combat damage that would be dealt by target attacking creature this turn.

{T}: Untap target attacking creature. Prevent all combat damage that would be dealt to and dealt by that creature this turn.

Minas Tirith enters the battlefield tapped unless you control a legendary creature. {T}: Add {W}. {1}{W}, {T}: Draw a card. Activate only if you attacked with two or more creatures this turn.

{T}: Add {C}. {2}, {T}: Choose a color. Add an amount of mana of that color equal to your devotion to that color. (Your devotion to a color is the number of mana symbols of that color in the mana costs of permanents you control.)

({T}: Add {W}.)

{T}, Pay 1 life, Sacrifice Prismatic Vista: Search your library for a basic land card, put it onto the battlefield, then shuffle.

{T}: Add {C}. {4}, {T}: Target creature can't be blocked this turn.

Secluded Steppe enters the battlefield tapped. {T}: Add {W}. Cycling {W} ({W}, Discard this card: Draw a card.)

{T}: Add {C}. {1}, {T}: Add one mana of any color. {X}, {T}: The Mycosynth Gardens becomes a copy of target nontoken artifact you control with mana value X.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I — Urza's Saga gains "{T}: Add {C}." II — Urza's Saga gains "{2}, {T}: Create a 0/0 colorless Construct artifact creature token with 'This creature gets +1/+1 for each artifact you control.'" III — Search your library for an artifact card with mana cost {0} or {1}, put it onto the battlefield, then shuffle.

Protection from black and from red Whenever another creature enters the battlefield, you may gain 1 life.

Creatures your opponents control enter the battlefield tapped. Whenever a creature enters the battlefield under an opponent's control, you gain 1 life.

Whenever another creature enters the battlefield, you gain 1 life.

During your turn, your opponents can't cast spells or activate abilities of artifacts, creatures, or enchantments.

{T}: Target creature you control gains protection from the color of your choice until end of turn.

Counter target spell that targets a permanent you control.

{T}: Add one mana of any color in your commander's color identity.

When Archaeomancer's Map enters the battlefield, search your library for up to two basic Plains cards, reveal them, put them into your hand, then shuffle. Whenever a land enters the battlefield under an opponent's control, if that player controls more lands than you, you may put a land card from your hand onto the battlefield.

As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery. Spells you cast of the chosen type cost {1} less to cast.

Flash Mold Earth — Whenever one or more lands enter the battlefield under an opponent's control without being played, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle. Do this only once each turn.

{2}, {T}, Sacrifice Expedition Map: Search your library for a land card, reveal it, put it into your hand, then shuffle.

Imprint — When Extraplanar Lens enters the battlefield, you may exile target land you control. Whenever a land with the same name as the exiled card is tapped for mana, its controller adds one mana of any type that land produced.

{T}: Add one mana of any color that a land an opponent controls could produce.

Artifact spells you cast cost {1} less to cast.

{T}: Add {C}{C}. {2}, {T}, Sacrifice Hedron Archive: Draw two cards.

{T}: Add {C}. {1}, {T}, Sacrifice Mind Stone: Draw a card.

Metalcraft — {T}: Add one mana of any color. Activate only if you control three or more artifacts.

{T}: Add {C}{C}.

You have no maximum hand size. {T}: Add {C}.

Return target artifact or creature card with mana value 3 or less from your graveyard to the battlefield. If a creature enters the battlefield this way, it enters with an additional +1/+1 counter on it.

Destroy all lands.

Artifact and enchantment spells your opponents cast cost {2} more to cast. Sacrifice Aura of Silence: Destroy target artifact or enchantment.

Choose two — • Destroy all artifacts. • Destroy all enchantments. • Destroy all creatures with mana value 3 or less. • Destroy all creatures with mana value 4 or greater.

Destroy target artifact or enchantment.

Destroy target permanent. Its controller creates a 3/3 green Elephant creature token.

When Grasp of Fate enters the battlefield, for each opponent, exile up to one target nonland permanent that player controls until Grasp of Fate leaves the battlefield. (Those permanents return under their owners' control.)

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Return target spell to its owner's hand. Draw a card.

If a creature an opponent controls would die, exile it instead. {2}, {T}, Sacrifice Stone of Erech: Exile target player's graveyard. Draw a card.

Exile target creature. Its controller gains life equal to its power.

Destroy all creatures with power 3 or greater. Then create a Food token for each creature you control. (It's an artifact with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")

Triskelion enters the battlefield with three +1/+1 counters on it. Remove a +1/+1 counter from Triskelion: It deals 1 damage to any target.

Flying Each player can't cast more than one spell each turn. Nonbasic lands your opponents control enter the battlefield tapped.

Flash Flying If an opponent would search a library, that player searches the top four cards of that library instead.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.) Artifacts and creatures your opponents control enter the battlefield tapped.

Flash If a nontoken creature would enter the battlefield and it wasn't cast, exile it instead.

Nonwhite creatures with power 3 or greater don't untap during their controllers' untap steps.

If a land is tapped for two or more mana, it produces {C} instead of any other type and amount. Each spell a player casts costs {1} more to cast for each other spell that player has cast this turn.

Your opponents can't cast spells from anywhere other than their hands.

Spells cost {1} more to cast.

First strike Noncreature spells cost {1} more to cast.

Search your library for an artifact or enchantment card, reveal it, then shuffle and put that card on top.

When Ranger-Captain of Eos enters the battlefield, you may search your library for a creature card with mana value 1 or less, reveal it, put it into your hand, then shuffle. Sacrifice Ranger-Captain of Eos: Your opponents can't cast noncreature spells this turn.

Vigilance Whenever an artifact or creature enters the battlefield untapped and under an opponent's control, they may tap that permanent. If they don't, you create a 1/1 white Vampire creature token with lifelink.

Vigilance, lifelink At the beginning of your upkeep, if you have 40 or more life, you win the game.

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Artifacts, creatures, and lands your opponents control enter the battlefield tapped.

At the beginning of your upkeep, if an opponent controls more lands than you, you may search your library for up to three basic land cards, reveal them, put them into your hand, then shuffle.

Creatures with power 3 or greater don't untap during their controllers' untap steps.

White spells you cast cost {1} less to cast.

When Ranger of Eos enters the battlefield, you may search your library for up to two creature cards with mana value 1 or less, reveal them, put them into your hand, then shuffle.

{T}: Add {C}. {2}, {T}, Sacrifice Roadside Reliquary: Draw a card if you control an artifact. Draw a card if you control an enchantment.

When Sarevok's Tome enters the battlefield, you take the initiative. {T}: Add {C}. If you have the initiative, add {C}{C} instead. {3}, {T}: Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost. Activate only if you've completed a dungeon.

Legendary creatures don't untap during their controllers' untap steps. When Arena of the Ancients enters the battlefield, tap all legendary creatures.

Sacrifice a creature: Add {C}{C}.

Imprint — When Chrome Mox enters the battlefield, you may exile a nonartifact, nonland card from your hand. {T}: Add one mana of any of the exiled card's colors.

{T}: Add one mana of any color in your commander's color identity. Sacrifice Commander's Sphere: Draw a card.

Spells your opponents cast cost {2} more to cast. At the beginning of your end step, each opponent loses 1 life.

{T}: Add {W}.

Sacrifice an artifact: Add {C}{C}.

{T}: Add {C}. {T}: Target nonland permanent becomes an artifact in addition to its other types until end of turn.

Artifacts, creatures, and lands your opponents control enter the battlefield tapped.

Vigilance When Loyal Warhound enters the battlefield, if an opponent controls more lands than you, search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle.

If Mox Diamond would enter the battlefield, you may discard a land card instead. If you do, put Mox Diamond onto the battlefield. If you don't, put it into its owner's graveyard. {T}: Add one mana of any color.

Nyx Lotus enters the battlefield tapped. {T}: Choose a color. Add an amount of mana of that color equal to your devotion to that color. (Your devotion to a color is the number of mana symbols of that color in the mana costs of permanents you control.)

Magical Tinkering — {W}, {T}, Sacrifice an artifact: Search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put it onto the battlefield, then shuffle. Activate only as a sorcery.

Each player can't cast more than one non-Phyrexian spell each turn. Non-Phyrexian creatures enter the battlefield tapped.

Modular 2 (This creature enters the battlefield with two +1/+1 counters on it. When it dies, you may put its +1/+1 counters on target artifact creature.) {T}, Sacrifice an artifact: Search your library for a Construct card, reveal it, put it into your hand, then shuffle.

Exile all attacking creatures target player controls. That player may search their library for that many basic land cards, put those cards onto the battlefield tapped, then shuffle.

{T}: Add {C}. Put a point counter on Strixhaven Stadium. Whenever a creature deals combat damage to you, remove a point counter from Strixhaven Stadium. Whenever a creature you control deals combat damage to an opponent, put a point counter on Strixhaven Stadium. Then if it has ten or more point counters on it, remove them all and that player loses the game.

As Throne of Eldraine enters the battlefield, choose a color. {T}: Add four mana of the chosen color. Spend this mana only to cast monocolored spells of that color. {3}, {T}: Draw two cards. Spend only mana of the chosen color to activate this ability.