msem-instigator

Frenzy 2 (Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of turn.)
Whenever Aleud Blademaster becomes blocked, it gains double strike until end of turn.

Target instant or sorcery spell gains “This spell deals 4 damage to you.”

Choose one—
• Each opponent sacrifices a creature.
• Each opponent discards two cards.

Target creature gets +3/+3 and gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

Frenzy 1 (Whenever this creature attacks and isn't blocked, it gets +1/+0 until end of turn.)
Whenever Trading Traitor deals combat damage to a player, you lose life equal to the number of unblocked attacking creatures you control and draw that many cards.

Winnow (Damage dealt to this creature also causes you to lose that much life.)
Sacrifice Tormented Echo: Target creature gains winnow until end of turn.

Target player reveals their hand. You and that player secretly choose a nonland card from it. Then those cards are revealed. That player discards the chosen cards.

Each player chooses one card in their hand, then discards the rest.

Whenever Stargaze Spirit or another creature dies, you may gain 1 life.
Revive {3}{W} ({3}{W}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Skulking Claw can't be blocked by creatures with greater power.
Skulking Claw gets +1/+0 for each unblocked attacking creature you control.

Whenever your team sacrifices a creature, each opponent loses 1 life and you gain that much life.

Target creature gets -4/-4 until end of turn. When it dies this turn, create two 1/1 black Worm creature tokens.

{2}{B}: Reclaimed Kalak gains indestructible until end of turn.
Revive {3}{W} ({3}{W}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

As an additional cost to cast this spell, sacrifice a creature.
Return two target creature cards from your graveyard to your hand.

Enchant creature
Enchanted creature has distorted. (It can be blocked by tapped creatures but not untapped creatures.)
{1}{B}: Enchanted creature can't block this turn.

When Lunar Defractor enters, each player discards a card.
Revive {5}{B}{B} ({5}{B}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

When Kalak Culler enters, each opponent loses life equal to the number of creatures you've sacrificed this turn.
Revive—{3}{B}, Sacrifice a creature. ({3}{B}, Sacrifice a creature, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Whenever attackers are declared, defending player may pay 2 life for each creature you control attacking them. Then target creature gets -X/-X until end of turn, where X is the number of times that player didn't pay life this way.

When Infectious Corpse dies, each player loses 2 life.

Target creature gets -2/-1 and gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

Lifelink
Whenever you sacrifice a creature, you gain life equal to its power.

Frenzy 1 (Whenever this creature attacks and isn't blocked, it gets +1/+0 until end of turn.)
Whenever Haploc Blooddrinker becomes blocked, it gains lifelink until end of turn.

Creatures you control get +2/+0 until end of turn. Creatures target player controls gain winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

Enchant player
At the beginning of enchanted player's upkeep, up to two target creatures they control gain winnow until end of turn. (Damage dealt to a creature with winnow also causes its controller to lose that much life.)

If a spell or ability would cause its controller to draw a card this turn, that player discards a card instead.
If a player would gain life this turn, that player loses that much life instead.