Commander creatures you own have "Room abilities of dungeons you own trigger an additional time."

{T}: Add {W} or {U}. {W}{U}, {T}, Sacrifice Azorius Cluestone: Draw a card.

{T}: Add {W} or {U}. {W}{U}: Azorius Keyrune becomes a 2/2 white and blue Bird artifact creature with flying until end of turn.

{T}: Add {W} or {U}. {W/U}{W/U}{W/U}{W/U}, {T}, Sacrifice Azorius Locket: Draw two cards.

({T}: Add {U}.)

Whenever one or more +1/+1 counters are put on a permanent you control, you may pay {1}. If you do, create a 1/1 colorless Servo artifact creature token. {3}, {T}: Choose a counter on target permanent or player. Give that permanent or player another counter of that kind.

As long as you've completed a dungeon, Gloom Stalker has double strike.

Room abilities of dungeons you own trigger an additional time.

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.) At the beginning of your end step, if you have the initiative, draw a card. Draw another card if you've completed a dungeon. Choose a Background (You can have a Background as a second commander.)

Flying When Aarakocra Sneak enters the battlefield, you take the initiative.

Dungeoneer's Pack enters the battlefield tapped. {2}, {T}, Sacrifice Dungeoneer's Pack: You take the initiative, gain 3 life, draw a card, and create a Treasure token. Activate only as a sorcery. (A Treasure token is an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

When Feywild Caretaker enters the battlefield, you take the initiative. At the beginning of your end step, if you have the initiative, create a 1/1 blue Faerie Dragon creature token with flying.

Vigilance When Goliath Paladin enters the battlefield, you take the initiative.

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.

When Seasoned Dungeoneer enters the battlefield, you take the initiative. Whenever you attack, target attacking Cleric, Rogue, Warrior, or Wizard gains protection from creatures until end of turn. It explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on the creature, then put the card back or put it into your graveyard.)

When Tomb of Horrors Adventurer enters the battlefield, you take the initiative. Whenever you cast your second spell each turn, copy it. If you've completed a dungeon, copy that spell twice instead. You may choose new targets for the copies. (A copy of a permanent spell becomes a token.)

When Trailblazer's Torch enters the battlefield, you take the initiative. Whenever equipped creature becomes blocked, it deals 2 damage to each creature blocking it. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

When Undercellar Sweep enters the battlefield, you take the initiative. Whenever you attack, if you or a player you're attacking has the initiative, you create two 1/1 white Soldier creature tokens that are tapped and attacking.

Counter target creature or planeswalker spell. Venture into the dungeon. (Enter the first room or advance to the next room.)

When Cloister Gargoyle enters the battlefield, venture into the dungeon. (Enter the first room or advance to the next room.) As long as you've completed a dungeon, Cloister Gargoyle gets +3/+0 and has flying.

Equipped creature gets +1/+1. Whenever equipped creature attacks, venture into the dungeon. (Enter the first room or advance to the next room.) Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

When Displacer Beast enters the battlefield, venture into the dungeon. (Enter the first room or advance to the next room.) Displacement — {3}{U}: Return Displacer Beast to its owner's hand.

Dungeon Descent enters the battlefield tapped. {T}: Add {C}. {4}, {T}, Tap an untapped legendary creature you control: Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)

{T}: Add {C}. {3}, {T}: Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)

Flying When Eccentric Apprentice enters the battlefield, venture into the dungeon. (Enter the first room or advance to the next room.) At the beginning of combat on your turn, if you've completed a dungeon, up to one target creature becomes a Bird with base power and toughness 1/1 and flying until end of turn.

Climb Over — {T}: Target Wall can't block this turn. Tie Up — {3}, {T}: Target creature doesn't untap during its controller's next untap step. Rappel Down — {4}, {T}: Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)

Enchant creature Enchanted creature has flying and "Whenever this creature deals combat damage to a player, venture into the dungeon." (Enter the first room or advance to the next room.)

You may choose not to untap Immovable Rod during your untap step. Whenever Immovable Rod becomes untapped, venture into the dungeon. {3}{W}, {T}: For as long as Immovable Rod remains tapped, another target permanent loses all abilities and can't attack or block.

Creatures you control can't be blocked except by legendary creatures. Whenever one or more creatures you control deal combat damage to a player, venture into the dungeon. (Enter the first room or advance to the next room.)

Vigilance Whenever Nadaar, Selfless Paladin enters the battlefield or attacks, venture into the dungeon. (Enter the first room or advance to the next room.) Other creatures you control get +1/+1 as long as you've completed a dungeon.

Flying Whenever Planar Ally attacks, venture into the dungeon. (Enter the first room or advance to the next room.)

Flying, lifelink Whenever Radiant Solar or another nontoken creature enters the battlefield under your control, venture into the dungeon. (Enter the first room or advance to the next room.) {W}, Discard Radiant Solar: Venture into the dungeon and you gain 3 life.

Flying {3}, {T}, Tap another untapped creature you control: Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)

Defender {4}{U}: Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)

Whenever Shortcut Seeker deals combat damage to a player, venture into the dungeon. (Enter the first room or advance to the next room.)

Whenever you attack, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.") Whenever you sacrifice a Clue, venture into the dungeon. (Enter the first room or advance to the next room.)

When Veteran Dungeoneer enters the battlefield, venture into the dungeon. (Enter the first room or advance to the next room.)

Put a +1/+1 counter on each creature you control.

Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) Draw a card.

Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Put a +1/+1 counter on each of up to two target creatures.

Counter target spell. If that spell's mana value was 3 or less, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Return target nonland permanent to its owner's hand. If that permanent had mana value 3 or less, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) Draw a card.

({U/P} can be paid with either {U} or 2 life.) Draw two cards, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Choose one — • Put a +1/+1 counter on each of up to two target creatures. • Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) Entwine {3}{W} (Choose both if you pay the entwine cost.)

Draw three cards. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Flying Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.)

Flying Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.) Whenever Gryffwing Cavalry attacks, you may pay {1}{W}. If you do, target attacking creature without flying gains flying until end of turn.

Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.) {2}{W}, Remove two +1/+1 counters from among creatures you control: Destroy target artifact or enchantment.

Flying Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) When Light of the Legion dies, put a +1/+1 counter on each white creature you control.

Flying, vigilance Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.) When Parish-Blade Trainee dies, put its counters on target creature you control.

Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.) Whenever Savior of Ollenbock trains, exile up to one other target creature from the battlefield or creature card from a graveyard. When Savior of Ollenbock leaves the battlefield, put the exiled cards onto the battlefield under their owners' control.

Yawning Portal — You gain 1 life. (Leads to: Dungeon Level) Dungeon Level — Scry 1. (Leads to: Goblin Bazaar, Twisted Caverns) Goblin Bazaar — Create a Treasure token. (Leads to: Lost Level) Twisted Caverns — Target creature can't attack until your next turn. (Leads to: Lost Level) Lost Level — Scry 2. (Leads to: Runestone Caverns, Muiral's Graveyard) Runestone Caverns — Exile the top two cards of your library. You may play them. (Leads to: Deep Mines) Muiral's Graveyard — Create two 1/1 black Skeleton creature tokens. (Leads to: Deep Mines) Deep Mines — Scry 3. (Leads to: Mad Wizard's Lair) Mad Wizard's Lair — Draw three cards and reveal them. You may cast one of them without paying its mana cost.

Cave Entrance — Scry 1. (Leads to: Goblin Lair, Mine Tunnels) Goblin Lair — Create a 1/1 red Goblin creature token. (Leads to: Storeroom, Dark Pool) Mine Tunnels — Create a Treasure token. (Leads to: Dark Pool, Fungi Cavern) Storeroom — Put a +1/+1 counter on target creature. (Leads to: Temple of Dumathoin) Dark Pool — Each opponent loses 1 life and you gain 1 life. (Leads to: Temple of Dumathoin) Fungi Cavern — Target creature gets -4/-0 until your next turn. (Leads to: Temple of Dumathoin) Temple of Dumathoin — Draw a card.

Trapped Entry — Each player loses 1 life. (Leads to: Veils of Fear, Oubliette) Veils of Fear — Each player loses 2 life unless they discard a card. (Leads to: Sandfall Cell) Sandfall Cell — Each player loses 2 life unless they sacrifice a creature, artifact, or land. (Leads to: Cradle of the Death God) Oubliette — Discard a card and sacrifice a creature, an artifact, and a land. (Leads to: Cradle of the Death God) Cradle of the Death God — Create The Atropal, a legendary 4/4 black God Horror creature token with deathtouch.

{2}, Sacrifice this artifact: Draw a card.

Flying