msem-instigator

Flying
When Thunder Shrike enters the battlefield, choose up to two target permanents. For each of those permanents, you may tap or untap it.

When Thunderstep Ved enters the battlefield, it deals 1 damage to any target.

When Thunderwhirl Dancer enters the battlefield, it gets +X/+X until end of turn, where X is the number of +1/+1 counters among creatures you control. Then it fights up to one target creature.

Flash
Menagerie — When Tidal Trickster enters the battlefield, if there are five or more creature types among creatures you control, you may search your library for a card named Tidal Trickster, reveal it, put it into your hand, then shuffle.

Kicker {X}{U} (You may pay an additional {X}{U} as you cast this spell.)
When Tidetwister Mage enters the battlefield, if it was kicked, return all other creatures with power X or less to their owners' hands.

Enchant creature
When Til Death enters the battlefield, exile target creature an opponent controls other than enchanted creature until Til Death leaves the battlefield.
Enchanted creature has defender.

When Tiller's Adze enters the battlefield, draw a card.
Equipped creature gets +1/+1.
Equip {1}

When Timecrafter Lafterii enters the battlefield, choose target permanent with one or more time counters on it, then put two time counters on it or remove two time counters from it.

Flying, lifelink
When Timestream Sentinel enters the battlefield, put two +1/+1 counters on each other creature named Timestream Sentinel you control.

When Tinker Tantrum enters the battlefield and at the beginning of your upkeep, you may sacrifice an artifact. If you do, reveal cards from the top of your library until you reveal an artifact card with mana value X or less, where X is 1 plus the sacrificed artifact's mana value. Put that card onto the battlefield and the rest on the bottom of your library in a random order.

When Tinyvale Trappings enters the battlefield, you may attach it to target creature you control with mana value 2 or less.
Equipped creature gets +3/+1.
Equip {3}

This spell has flash as long as you control a Soldier.
When Tinyvale Watchkeep enters the battlefield, untap target creature.

This spell costs {2} less to cast if you've cast another spell this turn.
Enchant creature
When Tire Out enters the battlefield, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Flying
Tribute 2 (As this creature enters the battlefield, an opponent of your choice may put two +1/+1 counters on it.)
When Tireless Vulture enters the battlefield, if tribute wasn't paid, each opponent loses 3 life. You gain life equal to the life lost this way.

When Titan of Lake Vasil enters the battlefield, untap up to four target permanents.
{3}{U}: Draw a card.

When Titou Louoe, Bayou Shaman enters the battlefield, create a blue Aura Curse enchantment token named Curse of Impotence attached to target player. The token has enchant player and “Creatures enchanted player controls get -1/-0.”

When To Go Beyond enters the battlefield, draw a card, then choose a card name.
{2}{U}: Reveal a card you own from outside the game with the chosen name and put it on top of your library.

Enchant creature
When Tomb Robber's Grit enters the battlefield, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
Enchanted creature gets +1/+1.

Chosen one ({W}{U}{B}{R}{G}: Transform this permanent.)
When Tomb Steward enters the battlefield, search your library for a card and put it into your graveyard. Then shuffle.

When Tombstone Looter enters the battlefield, you may draw a card. If you do, discard a card.
Unearth {1}{U} ({1}{U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the end step or if it would leave the battlefield. Unearth only as a sorcery.)

Flying
When Tormentor Harpy enters the battlefield, if there are three or more creature cards in your graveyard, target creature an opponent controls gets -3/-3 until end of turn.

Vigilance
When Tortle Guard enters the battlefield, it explores. (Reveal the top card of your library. Put it into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then you may put that card in your graveyard.)

Tortle Traveler enters the battlefield tapped.
When Tortle Traveler enters the battlefield, it explores. (Reveal the top card of your library. Put it into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then you may put that card in your graveyard.)

Flash
When Total Surveillance enters the battlefield, draw a card.
Whenever you cast another spell with flash or an instant, create a 1/1 colorless Drone artifact creature token with flying.

Flash
When Trade Route Bandit enters the battlefield, you may have each player draw two cards.