msem-instigator

Destroy target creature an opponent controls, then that player sacrifices a creature.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
When Ophelia's Neophyte enters the battlefield, you may have another target creature you control gain lifelink until end of turn.

Flying
When Palloren Vulture enters the battlefield, each player mills two cards.

{2}, {T}, Sacrifice a creature: Each opponent loses 2 life. You gain life equal to the life lost this way.

{B}: Revenant Shade gets +1/+1 until end of turn.

Put target creature card from a graveyard onto the battlefield under your control. That creature is a black Zombie in addition to its other colors and types.

Destroy target land. Create a 2/2 black Zombie creature token.

[+1]: Until end of turn, you may cast a creature card from your graveyard. Creature spells cast this way cost {2} less to cast.
[–2]: Each player discards a card. For each player who discarded a creature card this way, create a 2/1 black Horror creature token.
[–6]: For each player, you may put a creature card from that player's graveyard onto the battlefield under your control.

Menace (This creature can't be blocked except by two or more creatures.)
Whenever Sagi's Revenant deals combat damage to a player, that player discards a card.
Whenever an opponent discards a land card, you may have target creature get -2/-2 until end of turn.

Flying, lifelink
Whenever you gain life, you may have target creature get -X/-X until end of turn, where X is the amount of life you gained.

Target creature gets -2/-2 until end of turn. Scry 1.

Flying, trample
Whenever an opponent casts a noncreature spell, that player loses 5 life unless they sacrifice a creature or discard a card.

Enchant land
Enchanted land loses all land types, has “{T}: Add {C}”, and loses all other abilities.

When Twice-Lived Dead dies, create a 2/2 black Zombie creature token.

If you would lose life, exile that many cards from the top of your library instead.
If you would gain life, draw that many cards instead.
When Unhallowed Concordat leaves the battlefield, you lose life equal to the number of cards you own in exile.

Target creature gains lifelink until end of turn. (Damage dealt by that creature also causes you to gain that much life.)

Creatures you control gain deathtouch until end of turn.

{1}{B}, Sacrifice another creature: Put a +1/+1 counter on Voracious Ghoul.

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

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Young Tempter enters the battlefield, you draw a card and you lose 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.

Menace, haste
Whenever Aiel's Fury attacks, scry 2, then reveal the top card of your library. Aiel's Fury gets +X/+0 until end of turn, where X is that card's mana value.

Menace (This creature can't be blocked except by two or more creatures.)
Whenever a creature you control deals combat damage to a player, you may have Aspect of Rage deal 1 damage to any target.

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

Flying, haste
{1}{R}{R}: Return Bloodfire Phoenix from your graveyard to the battlefield. Activate only if an opponent lost 3 or more life this turn.