Sultai Skullkeeper

Creature — Naga Shaman (2/1)

When Sultai Skullkeeper enters the battlefield, mill two cards.

Supreme Phantom

Creature — Spirit (1/3)

Flying
Other Spirits you control get +1/+1.

Surveilling Sprite

Creature — Faerie Rogue (1/1)

Flying
When Surveilling Sprite dies, you may draw a card.

Sworn Guardian

Creature — Merfolk Warrior (1/3)

Tah-Crop Skirmisher

Creature — Naga Warrior (2/1)

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

Talas Explorer

Creature — Human Pirate Scout (1/1)

Flying
When Talas Explorer enters the battlefield, look at target opponent's hand.

Talas Merchant

Creature — Human Pirate (1/3)

Talas Scout

Creature — Human Pirate Scout (1/2)

Flying

Tattered Haunter

Creature — Spirit (2/1)

Flying
Tattered Haunter can block only creatures with flying.

Tawnos, Solemn Survivor

Legendary Creature — Human Artificer (1/3)

, : Create a token that's a copy of up to one target artifact token you control. Mill two cards.
, , Sacrifice two artifact tokens, Exile an artifact or creature card from your graveyard: Create a token that's a copy of the exiled card, except it's an artifact in addition to its other types. Activate only as a sorcery.

Tempest Owl

Creature — Bird (1/2)

Kicker (You may pay an additional as you cast this spell.)
Flying
When Tempest Owl enters the battlefield, if it was kicked, tap up to three target permanents.

Tetsuko Umezawa, Fugitive

Legendary Creature — Human Rogue (1/3)

Creatures you control with power or toughness 1 or less can't be blocked.

Thalakos Seer

Creature — Thalakos Wizard (1/1)

Shadow (This creature can block or be blocked by only creatures with shadow.)
When Thalakos Seer leaves the battlefield, draw a card.

Thalakos Sentry

Creature — Thalakos Soldier (1/2)

Shadow (This creature can block or be blocked by only creatures with shadow.)

Thassa's Oracle

Creature — Merfolk Wizard (1/3)

When Thassa's Oracle enters the battlefield, look at the top X cards of your library, where X is your devotion to blue. Put up to one of them on top of your library and the rest on the bottom of your library in a random order. If X is greater than or equal to the number of cards in your library, you win the game. (Each in the mana costs of permanents you control counts toward your devotion to blue.)

The Reality Chip

Legendary Artifact Creature — Equipment Jellyfish (0/4)

You may look at the top card of your library any time.
As long as The Reality Chip is attached to a creature, you may play lands and cast spells from the top of your library.
Reconfigure (: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

Thieving Skydiver

Creature — Merfolk Rogue (2/1)

Kicker . X can't be 0. (You may pay an additional as you cast this spell.)
Flying
When Thieving Skydiver enters the battlefield, 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.

Thought Courier

Creature — Human Wizard (1/1)

: Draw a card, then discard a card.

Thought Eater

Creature — Beast (2/2)

Flying
Your maximum hand size is reduced by three.

Thrummingbird

Creature — Phyrexian Bird Horror (1/1)

Flying
Whenever Thrummingbird deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)