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

As Aquamorph Entity enters the battlefield or is turned face up, it becomes your choice of 5/1 or 1/5. Morph {2}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Flying

Flash When Brinebarrow Intruder enters the battlefield, target creature an opponent controls gets -2/-0 until end of turn.

Shroud (This creature can't be the target of spells or abilities.) Landfall — Whenever a land enters the battlefield under your control, you may switch Calcite Snapper's power and toughness until end of turn.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Whenever Cleric of Chill Depths blocks a creature, that creature doesn't untap during its controller's next untap step.

Flying {1}{W}: Coastline Chimera can block an additional creature this turn.

Flash

Morph—Reveal a blue card in your hand. (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When Dragon's Eye Savants is turned face up, look at target opponent's hand.

Descend 4 — Frilled Cave-Wurm gets +2/+0 as long as there are four or more permanent cards in your graveyard.

Giant Ox crews Vehicles using its toughness rather than its power.

Heroic — Whenever you cast a spell that targets Lagonna-Band Trailblazer, put a +1/+1 counter on Lagonna-Band Trailblazer.

{1}, Sacrifice Living Lectern: Draw a card. Create a Sorcerer Role token attached to up to one other target creature you control. Activate only as a sorcery. (If you control another Role on it, put that one into the graveyard. Enchanted creature gets +1/+1 and has "Whenever this creature attacks, scry 1.")

Vigilance

Vigilance When Riptide Crab dies, draw a card.

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

Flying {1}{W}: Senate Courier gains vigilance until end of turn.

When Canal Courier enters the battlefield, you become the monarch. Whenever Canal Courier and another creature attack different players, Canal Courier can't be blocked this combat.

Draw two cards.

Glistener Seer enters the battlefield with three oil counters on it. {T}, Remove an oil counter from Glistener Seer: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Whenever equipped creature deals combat damage to a player, scry 1, then draw a card. (To scry 1, look at the top card of your library, then you may put that card on the bottom of your library.) Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) Whenever Jhessian Thief deals combat damage to a player, draw a card.

Whenever Library Larcenist attacks, draw a card.

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.)

Flash (You may cast this spell any time you could cast an instant.) Enchant creature Whenever enchanted creature deals damage to an opponent, you may draw a card.

Look at the top three cards of your library, then put them back in any order. You may shuffle. Draw a card.

Whenever Saltwater Stalwart deals damage to an opponent, target player draws a card.

Whenever Scroll Thief deals combat damage to a player, draw a card.

Archway Commons enters the battlefield tapped. When Archway Commons enters the battlefield, sacrifice it unless you pay {1}. {T}: Add one mana of any color.

Azorius Chancery enters the battlefield tapped. When Azorius Chancery enters the battlefield, return a land you control to its owner's hand. {T}: Add {W}{U}.

Citadel Gate enters the battlefield tapped. As Citadel Gate enters the battlefield, choose a color other than white. {T}: Add {W} or one mana of the chosen color.

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

({T}: Add {U}.)

When Obscura Storefront enters the battlefield, sacrifice it. When you do, search your library for a basic Plains, Island, or Swamp card, put it onto the battlefield tapped, then shuffle and you gain 1 life.

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.)

({T}: Add {W}.)

Public Thoroughfare enters the battlefield tapped. When Public Thoroughfare enters the battlefield, sacrifice it unless you tap an untapped artifact or land you control. {T}: Add one mana of any color.

Sandstone Bridge enters the battlefield tapped. When Sandstone Bridge enters the battlefield, target creature gets +1/+1 and gains vigilance until end of turn. {T}: Add {W}.

Sea Gate enters the battlefield tapped. As Sea Gate enters the battlefield, choose a color other than blue. {T}: Add {U} or one mana of the chosen color.

The Fair Basilica enters the battlefield tapped. {T}: Add {W}. {1}{W}, {T}, Sacrifice The Fair Basilica: Draw a card.

The Surgical Bay enters the battlefield tapped. {T}: Add {U}. {1}{U}, {T}, Sacrifice The Surgical Bay: Draw a card.

Thriving Isle enters the battlefield tapped. As Thriving Isle enters the battlefield, choose a color other than blue. {T}: Add {U} or one mana of the chosen color.

Tranquil Cove enters the battlefield tapped. When Tranquil Cove enters the battlefield, you gain 1 life. {T}: Add {W} or {U}.

Whenever you cast a blue, black, or red spell, you gain 1 life.

Flash When Dawnfluke enters the battlefield, prevent the next 3 damage that would be dealt to any target this turn. Evoke {W} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

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

{U}, {T}: Add {C}{C}{C}.

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

{1}, {T}: Add {W}{U}.

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

When Citizen's Arrest enters the battlefield, exile target creature or planeswalker an opponent controls until Citizen's Arrest leaves the battlefield.

Changeling (This card is every creature type.) Exile target creature. Its controller creates a 1/1 colorless Shapeshifter creature token with changeling.

Choose one — • Destroy target creature with toughness 4 or greater. • Destroy target enchantment.

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

Destroy target attacking creature.

When Corridor Monitor enters the battlefield, untap target artifact or creature you control.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.) As long as Galvanic Alchemist is paired with another creature, each of those creatures has "{2}{U}: Untap this creature."