When Tomb of Horrors Adventurer enters, 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.)

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

At the beginning of each upkeep, if Tombstone Stairwell is on the battlefield, each player creates a 2/2 black Zombie creature token with haste named Tombspawn for each creature card in their graveyard.

At the beginning of each end step and when Tombstone Stairwell leaves the battlefield, destroy all tokens created with Tombstone Stairwell. They can't be regenerated.

When Topography Tracker enters, create a Map token. (It's an artifact with ", , Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery.")

If a creature you control would explore, instead it explores, then it explores again.

Torch the Witness deals twice X damage to target creature. If excess damage was dealt to that creature this way, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Whenever one or more cards leave your graveyard, create a tapped 2/2 black Zombie creature token.

Partner (You can have two commanders if both have partner.)

If a source you control would deal noncombat damage to an opponent, it deals that much damage plus 2 instead.

(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)

When Tough Cookie enters, create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")

: Target noncreature artifact you control becomes a 4/4 artifact creature until end of turn.

, , Sacrifice Tough Cookie: You gain 3 life.

Whenever Tovolar's Packleader enters or attacks, create two 2/2 green Wolf creature tokens.

: Another target Wolf or Werewolf you control fights target creature you don't control.

Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

At the beginning of each end step, put a slime counter on each creature you don't control.

Creatures you don't control get -1/-1 for each slime counter on them.

Whenever a creature you don't control with a slime counter on it dies, create a 1/1 black Slug creature token.

, Sacrifice a Slug: Draw a card.

When Trail of Crumbs enters, create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")

Whenever you sacrifice a Food, you may pay . If you do, look at the top two cards of your library. You may reveal a permanent card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Create two 2/2 white Knight creature tokens with vigilance. (Then exile this card. You may cast the creature later from exile.)

, , Sacrifice a creature: Add .

, , Sacrifice a creature: Create a 3/3 colorless Zombie artifact creature token. Activate only as a sorcery.

: Create your choice of a Blood token, a Clue token, or a Food token.

, , Sacrifice three artifact tokens with different names: Search your library for an artifact card, put it onto the battlefield, then shuffle. Activate only as a sorcery.

Put up to one target instant or sorcery card from your graveyard on top of your library.

Amass Orcs 2. (To amass Orcs 2, put two +1/+1 counters on an Army you control. It's also an Orc. If you don't control an Army, create a 0/0 black Orc Army creature token first.)

, , Pay 1 life: Create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

: Add .

, , Sacrifice Treasure Vault: Create X Treasure tokens.

Trample, ward

When Treebeard, Gracious Host enters, create two Food tokens.

Whenever you gain life, put that many +1/+1 counters on target Halfling or Treefolk.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)

I, II, III — Exile target nontoken creature an opponent controls until Trial of a Time Lord leaves the battlefield.

IV — Starting with you, each player votes for innocent or guilty. If guilty gets more votes, the owner of each card exiled with Trial of a Time Lord puts that card on the bottom of their library.

Whenever Tribune of Rot attacks, mill two cards. For each creature card milled this way, create a 1/1 green Saproling creature token.

Trick Shot deals 6 damage to target creature and 2 damage to up to one other target creature token.

Trigon of Infestation enters with three charge counters on it.

, : Put a charge counter on Trigon of Infestation.

, , Remove a charge counter from Trigon of Infestation: Create a 1/1 green Phyrexian Insect creature token with infect.

Flying, vigilance, trample

When Triplicate Titan dies, create a 3/3 colorless Golem artifact creature token with flying, a 3/3 colorless Golem artifact creature token with vigilance, and a 3/3 colorless Golem artifact creature token with trample.

Other creatures you control get +1/+1.

When Trostani Discordant enters, create two 1/1 white Soldier creature tokens with lifelink.

At the beginning of your end step, each player gains control of all creatures they own.

Exile target creature, then populate. (Create a token that's a copy of a creature token you control.)

Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.)

When Troublemaker Ouphe enters, if it was bargained, exile target artifact or enchantment an opponent controls.

When Trove Tracker dies, draw a card.

Encore (, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

Trueheart Duelist can block an additional creature each combat.

Embalm (, Exile this card from your graveyard: Create a token that's a copy of it, except it's a white Zombie Human Warrior with no mana cost. Embalm only as a sorcery.)

Create a 3/3 green Elephant creature token.

Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

When Tukatongue Thallid dies, create a 1/1 green Saproling creature token.

Create an X/X green Elemental creature token, where X is the greatest power among creatures you control.

Plot (You may pay and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)

Flying

Whenever you cast an instant or sorcery spell, create a 1/1 white Soldier creature token.

Whenever Turntimber Ranger or another Ally you control enters, you may create a 2/2 green Wolf creature token. If you do, put a +1/+1 counter on Turntimber Ranger.

Whenever a creature token leaves the battlefield, put a +1/+1 counter on Twilight Drover.

, Remove a +1/+1 counter from Twilight Drover: Create two 1/1 white Spirit creature tokens with flying.

Flying, vigilance, ward

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn.

Create a Wicked Role token attached to up to one target creature. (If you control another Role on it, put that one into the graveyard. Enchanted creature gets +1/+1. When this Aura is put into a graveyard, each opponent loses 1 life.)

: Add one mana of any color. Put a nest counter on Twitching Doll.

, Sacrifice Twitching Doll: Create a 2/2 green Spider creature token with reach for each counter on Twitching Doll. Activate only as a sorcery.

Flying, ward

Shrieking Gargoyles — Whenever Tyranid Harridan or another Tyranid you control deals combat damage to a player, create a 1/1 blue Tyranid Gargoyle creature token with flying.

Elves you control have ": Add ."

+1: Put a +1/+1 counter on up to one target Elf. Untap it. It gains deathtouch until end of turn.

0: Create a 1/1 green Elf Warrior creature token.

−6: You get an emblem with "Whenever you cast an Elf spell, it gains haste until end of turn and you draw two cards."

Colorless spells you cast cost less to cast.

+1: Exile the top card of your library face down and look at it. Create a 2/2 colorless Spirit creature token. When that token leaves the battlefield, put the exiled card into your hand.

−3: Destroy target permanent that's one or more colors.

Vigilance

Ward—Sacrifice a permanent with mana value 1 or greater.

: Create a 10/10 colorless Eldrazi creature token.

When Ulder Ravengard, Marshal enters the battlefield, another target nontoken creature you control gains double team until end of turn.

Whenever Ulder Ravengard attacks, conjure a duplicate of another target nontoken attacking creature into your hand.

Whenever a nontoken creature you control dies, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Whenever you sacrifice a Clue, create a 1/1 white Human Soldier creature token.

When Unassuming Sage enters, you may pay . If you do, create a Sorcerer Role token attached to it. (Enchanted creature gets +1/+1 and has "Whenever this creature attacks, scry 1.")

If a Zombie you control would deal combat damage to a player, instead that player mills that many cards.

Whenever a creature card is put into an opponent's graveyard from their library, exile that card and create a 2/2 black Zombie creature token.

When Undercellar Myconid enters or dies, create a 1/1 green Saproling creature token.

: Add one mana of any color.

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.

Whenever Undercover Crocodelf deals combat damage to a player, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Disguise (You may cast this card face down for as a 2/2 creature with ward . Turn it face up any time for its disguise cost.)

Target nontoken creature you control gets +2/+0 and gains double team until end of turn. It also gains first strike until end of turn if it has the same name as another creature you control or a creature card in your graveyard.

Devoid (This card has no color.)

Draw three cards and create a 0/1 colorless Eldrazi Spawn creature token with "Sacrifice this creature: Add ."

At the beginning of your end step, draw a card. If you control a Demon, each opponent loses 2 life and you gain 2 life. Otherwise, you lose 2 life.

(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)