When They Came from the Pipes enters, manifest dread twice. (To manifest dread, look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)

Whenever a face-down creature you control enters, draw a card.

When Thickest in the Thicket enters, put X +1/+1 counters on target creature, where X is that creature's power.

At the beginning of your end step, draw two cards if you control the creature with the greatest power or tied for the greatest power.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Other Elementals you control have trample.

You may pay rather than pay the echo cost for permanents you control.

: Thick-Skinned Goblin gains protection from red until end of turn.

Devoid (This card has no color.)

When you cast this spell, exile up to one target noncreature, nonland permanent an opponent controls with mana value 4 or less. If you do, Thief of Existence gains "When this creature leaves the battlefield, target opponent draws a card."

Flying

Whenever Thief of Sanity deals combat damage to a player, look at the top three cards of that player's library, exile one of them face down, then put the rest into their graveyard. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.

Prowl (You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue.)

Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

When Thieves' Tools enters, create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

Equipped creature can't be blocked as long as its power is 3 or less.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

Flying (This creature can't be blocked except by creatures with flying or reach.)

Whenever Thieving Magpie deals damage to an opponent, draw a card.

Kicker . X can't be 0. (You may pay an additional as you cast this spell.)

Flying

When Thieving Skydiver enters, if it was kicked, gain control of target artifact with mana value X or less. If that artifact is an Equipment, attach it to Thieving Skydiver.

Deathtouch, lifelink

, Pay 1 life: Add two mana of any one color. Spend this mana only to cast spells you don't own.

Whenever Thing from the Deep attacks, sacrifice it unless you sacrifice an Island.

At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Equipped creature gets +1/+2.

Equip Detective

Equip (: Attach to target creature you control. Equip only as a sorcery.)

: Draw two cards.

Draw three cards. Then discard two cards unless you discard a basic land card.

Draw three cards. Then discard two cards unless you discard an enchantment card.

Other Vampires you control get +1/+1.

Lifelink

: Thirsting Shade gets +1/+1 until end of turn.

This spell costs less to cast if it targets a permanent you control.

Return up to two target nonland permanents to their owners' hands.

Flash

Other white creatures you control get +1/+1.

Other blue creatures you control get +1/+1.

Whenever an artifact you control enters, target creature gains flying until end of turn.

Flying

At the beginning of your upkeep, if you control no Thopters other than Thopter Assembly, return Thopter Assembly to its owner's hand and create five 1/1 colorless Thopter artifact creature tokens with flying.

, Sacrifice a nontoken artifact: Create a 1/1 blue Thopter artifact creature token with flying. You gain 1 life.

Whenever one or more artifact creatures you control die, draw a card. This ability triggers only once each turn.

, : Create a 1/1 colorless Thopter artifact creature token with flying.

Flying

Thopter Squadron enters with three +1/+1 counters on it.

, Remove a +1/+1 counter from Thopter Squadron: Create a 1/1 colorless Thopter artifact creature token with flying. Activate only as a sorcery.

, Sacrifice another Thopter: Put a +1/+1 counter on Thopter Squadron. Activate only as a sorcery.

Whenever Thorn Lieutenant becomes the target of a spell or ability an opponent controls, create a 1/1 green Elf Warrior creature token.

: Thorn Lieutenant gets +4/+4 until end of turn.

Noncreature spells cost more to cast.

At the beginning of your upkeep, put a spore counter on Thorn Thallid.

Remove three spore counters from Thorn Thallid: It deals 1 damage to any target.

Equipped creature has ", : This creature deals 1 damage to any target" and "Whenever a creature dies, untap this creature."

Whenever a Shaman creature enters, you may attach Thornbite Staff to it.

Equip

Sliver creatures you control have "Whenever this creature attacks, it deals 1 damage to any target."

Thornglint Bridge enters tapped.

Indestructible

: Add or .

: Thornling gains haste until end of turn.

: Thornling gains trample until end of turn.

: Thornling gains indestructible until end of turn.

: Thornling gets +1/-1 until end of turn.

: Thornling gets -1/+1 until end of turn.

Offspring (You may pay an additional as you cast this spell. If you do, when this creature enters, create a 1/1 token copy of it.)

When this creature enters, target opponent loses 3 life unless they sacrifice a nonland permanent of their choice or discard a card.

Kicker and/or (You may pay an additional and/or as you cast this spell.)

When Thornscape Battlemage enters, if it was kicked with its kicker, it deals 2 damage to any target.

When Thornscape Battlemage enters, if it was kicked with its kicker, destroy target artifact.

, : Thornscape Master deals 2 damage to target creature.

, : Target creature gains protection from the color of your choice until end of turn.

Devour 2 (As this enters, you may sacrifice any number of creatures. This creature enters with twice that many +1/+1 counters on it.)

: Thorn-Thrash Viashino gains trample until end of turn.

: Add .

, Forage: Add two mana in any combination of colors. (To forage, exile three cards from your graveyard or sacrifice a Food.)

, : Search your library for a Squirrel card, reveal it, put it into your hand, then shuffle.

Reach (This creature can block creatures with flying.)

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

This land enters tapped.

When this land enters, you gain 1 life.

: Add or .

: Draw a card, then discard a card.

, : Target opponent reveals cards from the top of their library until an artifact card or X cards are revealed, whichever comes first. If an artifact card is revealed this way, put it onto the battlefield under your control and sacrifice Thought Dissector. Put the rest of the revealed cards into that player's graveyard.

Flying

Your maximum hand size is reduced by three.

Trample

When Thought Gorger enters, put a +1/+1 counter on it for each card in your hand. If you do, discard your hand.

When Thought Gorger leaves the battlefield, draw a card for each +1/+1 counter on it.

Choose a nonland card name. Target player reveals their hand. Thought Hemorrhage deals 3 damage to that player for each card with the chosen name revealed this way. Search that player's graveyard, hand, and library for all cards with that name and exile them. Then that player shuffles.

Affinity for artifacts (This spell costs less to cast for each artifact you control.)

Flying

When Thought Monitor enters, draw two cards.

Imprint — When Thought Prison enters, you may have target player reveal their hand. If you do, choose a nonland card from it and exile that card.

Whenever a player casts a spell that shares a color or mana value with the exiled card, Thought Prison deals 2 damage to that player.

Target player mills two cards.

Draw a card.

Flash

Thought Sponge enters with a number of +1/+1 counters on it equal to the greatest number of cards an opponent has drawn this turn.

When Thought Sponge dies, draw cards equal to its power.