msem-instigator

When Third Legion Rider enters the battlefield, if you control an embattled creature, tap target creature an opponent controls. It doesn't untap during its controller's next untap step. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

{1}{B}: Target Knight or Soldier you control gains deathtouch until end of turn.

Reach, deathtouch

Prismatic — Whenever you cast a multicolored spell, Thorny Bushwacker has base power and toughness 5/3 until end of turn.

Whenever a creature enters the battlefield under an opponent's control, draw a card unless that player pays {1}.

When Thoughtgrinder enters the battlefield, each player discards a card.
Unearth {1}{U}{B} ({1}{U}{B}: 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.)

When Thoughtslick Engineer enters the battlefield, each player discards a card at random.

Flash
When Threadripper Savant enters the battlefield, put a stun counter on up to one target creature.

When Three Seas Squire enters the battlefield, target creature or Vehicle gets +2/+1 until end of turn.

This spell costs {X} less to cast, where X is the greatest power among creatures you control.
Trample

Flash
Cycling {2} ({2}, Discard this card: Draw a card.)

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

Whenever Tide Crasher attacks, if you control another Merfolk, tap target creature defending player controls.

Embellish {3}{B} (If you cast this spell for {3}{B}, create a 1/1 blue Thopter artifact creature token with flying when it enters the battlefield.)
Tidehollow Lich can't block.
You may cast Tidehollow Lich from your graveyard as long as you control an artifact creature.

Menace, haste
Whenever Tiger of the Drums attacks, choose one —
• Exile target opponent's graveyard.
• You draw a card and lose 1 life.
• Torment each opponent. (They lose 3 life unless they discard a card or sacrifice a nonland permanent.)

Return target permanent to its owner's hand. If this spell wasn't cast from your hand, put that permanent on top of its owner's library instead.
Coalesce {9}{U} (You may cast this from your graveyard for its coalesce cost. If you do, put it onto the battlefield as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)

Double strike (This creature deals both first-strike and regular combat damage.)
If three or more creatures are attacking you, you may cast Timely Commander as though it had flash.

First strike
If one or more creature tokens would be created under your control, for each of those tokens, you may create three 2/2 green Cat Warrior creature tokens instead.

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.

Flying
Tizerus Bats can't block unless you control another creature with flying.

Creatures with power 4 or greater can't attack or block unless their controller pays {2} for each of those creatures.

Whenever a creature you control attacks, you may sacrifice a Treasure. If you do, that creature can't be blocked this turn.

Haste
Whenever Tortle Waymaker becomes blocked, 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.)

Trample

Reach
Towering Silkweaver can block an additional creature each combat.