msem-instigator

Flying
Synchronous Hellkite enters with a +1/+1 counter for each other artifact you control.
Sacrifice three artifacts: Return Synchronous Hellkite from your graveyard to the battlefield.

Menace, prowess

Enchant creature
When Synergistic Curiosity enters, create a 2/2 blue Rogue creature token.
Enchanted creature gets +1/+1 and can't be blocked by creatures with flying.

Up to two target creatures can't block this turn. Scry 1.

Haste
Whenever Tailor of Terror attacks, you may exile a creature card from your graveyard. If you do, put a +1/+1 counter on Tailor of Terror.

Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{6}{R}: Takara Flameblade deals 4 damage to target creature. Activate only once each turn.

Create two 1/1 black Rat Pirate creature tokens.
Whenever two or more creatures you control deal combat damage to a player, you may pay {2} and exile Take All You Can Carry from your graveyard. If you do, create two Treasure tokens.

First strike
Whenever Takeda Taro deals combat damage to an opponent, it deals 1 damage to each creature and planeswalker that player controls.

Whenever you cast a red instant or sorcery spell, you may exile a nonred instant or sorcery card from your graveyard. If you do, you may copy the exiled card and cast the copy without paying its mana cost.

Colossal 3—{7}{R}{R} (You may cast this for its colossal cost to have it enter with three +1/+1 counters; or pay {7}{R}{R} as a sorcery: Put three +1/+1 counters on it if it has none.)
Flying
Each creature you control with a counter on it has double strike.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Archive 3 (As this enters, shuffle the top three cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Whenever a source you control deals noncombat damage to a player, draw a card from the archived library.

[+2]: Create a 2/2 red Werewolf creature token with first strike and haste.
[–3]: Tanya deals 3 damage to each creature that's not a Wolf or a Werewolf.
[–8]: For each permanent your opponents control, that player sacrifices it unless they have Tanya deal 2 damage to them.

[+1]: Tanya, the Mooncursed becomes a legendary 3/1 red Werewolf creature with first strike until end of turn.
[–2]: Tanya, the Mooncursed deals 3 damage to target creature or planeswalker.
[–4]: Destroy target nonbasic colorless permanent.

Enchant opponent
Whenever enchanted player is attacked, you may discard a card. If you do, draw a card.

Flying
{2}{R}: Target creature attacks this turn if able.

Whenever a creature or planeswalker enters, its controller may have it deal damage equal to its power or loyalty to any target of that player's choice.

Tears of Samang deals 3 damage to each creature and each player. If an opponent would be dealt damage this way, you may have Tears of Samang deal 3 damage to a planeswalker they control instead.

Gain control of target creature with power 4 or less until end of turn. Untap that creature. It gains haste until end of turn.

Bleed {2}{R} (You may cast this spell for its bleed cost if an opponent has lost life this turn.)
Destroy target land.

Haste
Art of war — At the beginning of your end step, if Teikoku Skirmisher dealt damage to an opponent this turn, put a +1/+1 counter on it.

Defender

Double strike
At the beginning of each end step, if a creature you control died this turn, Tempered Survivor deals 2 damage to each opponent.

Temple Recluse gets +1/+0 as long as you've cast a noncreature spell this turn.

Flying, first strike
Whenever Terror of Sunset Cliffs attacks, each player discards their hand and draws seven cards.
Whenever an opponent discards a card, Terror of Sunset Cliffs deals 1 damage to that player.