msem-instigator

Enchant creature
When Heartstrings leaves the battlefield, exile enchanted creature.
Whenever enchanted creature attacks or blocks, exile it at end of combat.

Flying
Whenever you cast a spell from your graveyard, return Unliving Swarm from your graveyard to your hand.

{1}{B}, Sacrifice a creature or enchantment: Draw a card.
{4}{B}{B}, {T}: Return target creature or enchantment card from your graveyard to the battlefield with a veil counter on it. That permanent gains “If this permanent would leave the battlefield, exile it instead.”

Whenever one or more creatures die for the first time each turn, you draw a card and you lose 1 life.
Whenever you cast a black noncreature spell, Villainy deals 2 damage to any target and you gain 2 life.

When Warden of the Dead enters, you draw a card and you lose 1 life.
When Warden of the Dead dies, conjure three cards named Warden of the Dead and shuffle them into your main library. For the rest of the game, you may cast spells named Warden of the Dead without paying their mana costs.

Whenever an enchantment you control enters, target opponent loses 1 life and you gain 1 life.

[+1]: Aiel Tazan deals 2 damage to any target. Then she deals 2 damage to herself unless you have her deal 2 damage to you.
[–3]: Creatures you control get +2/+0 and gain haste until end of turn.
[–X]: Create an X/1 red Elemental creature token with haste and trample. Exile that token at the beginning of the next end step. If X is 6 or more, it gains double strike.

Haste
Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{1}{R}: Akaima Rager gets +1/+0 until end of turn.

Menace
Whenever Akoum Trailblazer deals combat damage to a player, you may discard a card. If you do, draw a card.
Whenever you discard a card, you may pay {R}. If you do, create a 1/1 red Goblin creature token.

Double strike
Renown 2 (When this creature deals combat damage to a player, if it isn't renowned, put two +1/+1 counters on it and it becomes renowned.)

Sabotage — Whenever an opponent or permanent an opponent controls becomes the target of a spell you control, Artisan of Brutality gets +2/+0 and gains first strike until end of turn.

Sacrifice a creature: Exile the top card of your library. Until end of turn, you may play that card.

Menace (This creature can't be blocked except by two or more creatures.)
Avatar of Basat can't block.

When Barricade Patrol enters, create a 1/1 white Human Soldier creature token.
Whenever another creature you control dies, Barricade Patrol deals 1 damage to target player.

Choose two —
• Destroy target artifact.
• Discard a card, then draw a card.
• Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Whenever you cast a spell, Daughter of Suisei deals 2 damage to target opponent if that spell has the same name as a card in your graveyard.

If you control an artifact, create three 1/1 colorless Construct artifact creature tokens. Otherwise, create one of those tokens.

Dreamchaser Djinni attacks each combat if able.

When Hate-Driven Arsonist enters, you may have it deal X damage to target creature or planeswalker, where X is the number of instant and sorcery cards in your graveyard.

Cast this spell only before attackers are declared.
Target creature you control gets +X/+0 until end of turn and gains haste until end of turn, where X is its power. At the beginning of the next end step, sacrifice that creature if it attacked this turn.

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

Target creature gets +X/+0 until end of turn, where X is the number of instant and sorcery cards in your graveyard.

{1}{R}: Performer of Desire gets +1/+1 and gains menace until end of turn. Then if its power is 4 or greater, you may transform it.

Flying, haste
Whenever Pyrus, the Undying Flame attacks, add {R}{R}{R}{R}. You don't lose this mana as steps, phases, and turns end.
{1}{R}: Pyrus gets +1/+0 until end of turn.

Choose one —
• Target creature gets +4/+2 until end of turn.
• Pyromantic Expertise deals 4 damage to target creature or planeswalker.