For each creature, its controller sacrifices a permanent unless they pay {1}.

Defender (This creature can't attack.) When Floodgate has flying, sacrifice it. When Floodgate leaves the battlefield, it deals damage equal to half the number of Islands you control, rounded down, to each nonblue creature without flying.

Flying When Mulldrifter enters the battlefield, draw two cards. Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

Cloudpost enters the battlefield tapped. {T}: Add {C} for each Locus on the battlefield.

When Glimmerpost enters the battlefield, you gain 1 life for each Locus on the battlefield. {T}: Add {C}.

({T}: Add {U}.)

Lonely Sandbar enters the battlefield tapped. {T}: Add {U}. Cycling {U} ({U}, Discard this card: Draw a card.)

Myriad Landscape enters the battlefield tapped. {T}: Add {C}. {2}, {T}, Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle.

({T}: Add {U}.) Mystic Sanctuary enters the battlefield tapped unless you control three or more other Islands. When Mystic Sanctuary enters the battlefield untapped, you may put target instant or sorcery card from your graveyard on top of your library.

Path of Ancestry enters the battlefield tapped. {T}: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it. If you control a Merfolk, draw a card.

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

When Coveted Jewel enters the battlefield, draw three cards. {T}: Add three mana of any one color. Whenever one or more creatures an opponent controls attack you and aren't blocked, that player draws three cards and gains control of Coveted Jewel. Untap it.

Multikicker {2} (You may pay an additional {2} any number of times as you cast this spell.) Everflowing Chalice enters the battlefield with a charge counter on it for each time it was kicked. {T}: Add {C} for each charge counter on Everflowing Chalice.

Until end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.

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

{T}: Add {C} for each artifact you control named Powerstone Shard.

{T}: Add {C}. {1}, {T}: Add one mana of any color.

Reveal a card in your hand, then put that card onto the battlefield if it has the same name as a permanent.

{T}: Add {U}.

Sky Diamond enters the battlefield tapped. {T}: Add {U}.

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

When Archaeomancer enters the battlefield, return target instant or sorcery card from your graveyard to your hand.

When Salvager of Secrets enters the battlefield, return target instant or sorcery card from your graveyard to your hand.

When Scholar of the Ages enters the battlefield, return up to two target instant and/or sorcery cards from your graveyard to your hand.

Counter target spell.

Flash Flying When Dream Eater enters the battlefield, surveil 4. When you do, you may return target nonland permanent an opponent controls to its owner's hand. (To surveil 4, look at the top four cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Imprint — When Duplicant enters the battlefield, you may exile target nontoken creature. As long as a card exiled with Duplicant is a creature card, Duplicant has the power, toughness, and creature types of the last creature card exiled with Duplicant. It's still a Shapeshifter.

When Meteor Golem enters the battlefield, destroy target nonland permanent an opponent controls.

Counter target noncreature spell.

Destroy target creature. It can't be regenerated. Its controller creates a 3/3 green Ape creature token.

Destroy target creature. It can't be regenerated. That creature's controller creates a 3/3 green Frog Lizard creature token.

Exile target artifact or creature. Its controller creates a 1/1 blue Bird creature token with flying. Foretell {U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Exile target creature. Its controller manifests the top card of their library. (That player puts the top card of their library onto the battlefield face down as a 2/2 creature. If it's a creature card, it can be turned face up any time for its mana cost.)

Counter target noncreature spell unless its controller pays {2}.

Flash When Voracious Greatshark enters the battlefield, counter target artifact or creature spell.

Change the text of target spell or permanent by replacing all instances of one color word with another. (This effect lasts indefinitely.) Flashback {1}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Target creature can't be blocked this turn. Flashback {U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Change the text of target spell or permanent by replacing all instances of one creature type with another. The new creature type can't be Wall. (This effect lasts indefinitely.)

Target creature becomes blue until end of turn. Untap that creature. Draw a card.

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.) Choose a counter on target permanent or suspended card. Remove that counter from that permanent or card or put another of those counters on it.

Target creature gains flying until end of turn. Flashback {U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Target creature you control gets +0/+3 and gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

Choose one — • Tap target permanent. • Untap target permanent. Entwine {1} (Choose both if you pay the entwine cost.)

Exile target creature you control, then return that card to the battlefield under its owner's control. If it's a Spirit, put a +1/+1 counter on it.

Target creature gets -1/-0 until end of turn. Draw a card.

Whenever Frost Titan becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays {2}. Whenever Frost Titan enters the battlefield or attacks, tap target permanent. It doesn't untap during its controller's next untap step.

Exile two target artifacts, creatures, and/or lands you control, then return those cards to the battlefield under your control.

You may tap or untap target permanent, then you may tap or untap another target permanent. Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)

Target creature gains flying until end of turn. Draw a card.

Buyback {2}{U} (You may pay an additional {2}{U} as you cast this spell. If you do, put this card into your hand as it resolves.) Tap target artifact, creature, or land.

Target creature you control gets +0/+1 and gains hexproof until end of turn. Overload {1}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Target spell or permanent becomes colorless.

Whenever you cast an instant or sorcery spell, create a 1/1 blue Bird Illusion creature token with flying.

Flying When Peregrine Drake enters the battlefield, untap up to five lands.

Target creature gains shadow until end of turn. (It can block or be blocked by only creatures with shadow.) Draw a card.

Devoid (This card has no color.) Target creature can't be blocked this turn. Draw a card.

Whenever you cast an instant or sorcery spell, create a 2/2 blue Drake creature token with flying.

Choose one — • Target nonsnow permanent becomes snow until end of turn. • Target snow permanent isn't snow until end of turn. Draw a card at the beginning of the next turn's upkeep.

Change the text of target permanent by replacing all instances of one color word with another or one basic land type with another until end of turn. Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)

You may tap or untap target artifact, creature, or land.

Switch target creature's power and toughness until end of turn. Draw a card.

{T}: Add {C}. {2}, {T}: Target legendary creature becomes a God in addition to its other types. Put a +1/+1 counter on it. {4}, {T}, Sacrifice Tyrite Sanctum: Put an indestructible counter on target God.