When Acererak the Archlich enters, if you haven't completed Tomb of Annihilation, return Acererak the Archlich to its owner's hand and venture into the dungeon.

Whenever Acererak the Archlich attacks, for each opponent, you create a 2/2 black Zombie creature token unless that player sacrifices a creature of their choice.

When Barrowin of Clan Undurr enters, venture into the dungeon. (Enter the first room or advance to the next room.)

Whenever Barrowin of Clan Undurr attacks, return up to one creature card with mana value 3 or less from your graveyard to the battlefield if you've completed a dungeon.

When Cloister Gargoyle enters, 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.

When Displacer Beast enters, venture into the dungeon. (Enter the first room or advance to the next room.)

Displacement — : Return Displacer Beast to its owner's hand.

: Add .

, : Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)

+1: Venture into the dungeon. (Enter the first room or advance to the next room.)

−2: Look at the top six cards of your library. You may reveal a creature card from among them and put it into your hand. If it's legendary, you gain 3 life. Put the rest on the bottom of your library in a random order.

−7: You get an emblem with "Creatures you control have trample and haste and get +2/+2 for each differently named dungeon you've completed."

Climb Over — : Target Wall can't block this turn.

Tie Up — , : Target creature doesn't untap during its controller's next untap step.

Rappel Down — , : 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.)

Reach

Pack tactics — Whenever Intrepid Outlander attacks, if you attacked with creatures with total power 6 or greater this combat, venture into the dungeon. (Enter the first room or advance to the next room.)

Put a +1/+1 counter on target creature. That creature gains haste until end of turn and can't be blocked by Walls this turn. Venture into the dungeon. (Enter the first room or advance to the next room.)

Vigilance

Whenever Nadaar, Selfless Paladin enters 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.

Enchant creature

When Precipitous Drop enters, venture into the dungeon. (Enter the first room or advance to the next room.)

Enchanted creature gets -2/-2. It gets -5/-5 instead as long as you've completed a dungeon.

Flying

, , 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.)

Whenever one or more creature cards are put into your graveyard from anywhere, venture into the dungeon. This ability triggers only once each turn. (To venture into the dungeon, enter the first room or advance to the next room.)

Create Undead — Whenever you complete a dungeon, return target creature card from your graveyard to the battlefield.

Whenever you attack, investigate. (Create a Clue token. It's an artifact with ", 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.)

You can't enter this dungeon unless you "venture into Undercity."

Secret Entrance — Search your library for a basic land card, reveal it, put it into your hand, then shuffle. (Forge, Lost Well)

Forge — Put two +1/+1 counters on target creature. (Trap, Arena)

Lost Well — Scry 2. (Arena, Stash)

Trap — Target player loses 5 life. (Archives)

Arena — Goad target creature. (Archives, Catacombs)

Stash — Create a Treasure token. (Catacombs)

Archives — Draw a card. (Throne of the Dead Three)

Catacombs — Create a 4/1 black Skeleton creature token with menace. (Throne of the Dead Three)

Throne of the Dead Three — Reveal the top ten cards of your library. Put a creature card from among them onto the battlefield with three +1/+1 counters on it. It gains hexproof until your next turn. Then shuffle.

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

Choose one —

• Smash It — Destroy target artifact.

• Lift the Curse — Destroy target enchantment.

• Steal Its Eyes — Create a Treasure token and venture into the dungeon. (Enter the first room or advance to the next room.)

Yuan-Ti Malison can't be blocked as long as it's attacking alone.

Whenever Yuan-Ti Malison deals combat damage to a player, venture into the dungeon. (Enter the first room or advance to the next room.)

At the beginning of your end step, if a creature died this turn, venture into the dungeon. (Enter the first room or advance to the next room.)