msem-instigator

[+1]: Up to one target creature gets +2/+0 until end of turn. Each player loses 1 life.
[–X]: Return target creature card with mana value X from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield.
[–7]: For each 1 life target player has less than their starting life total, create a 1/1 black Bird creature token with flying and deathtouch.

As an additional cost to cast this spell, exile a creature card from your graveyard.
Create a tapped 2/3 black Mummy creature token.

Destroy target creature.

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

{T}, Pay 1 life: Add {B}.
{T}, Pay 1 life, Sacrifice Murky Peat: Search your library for a Swamp card, put it onto the battlefield tapped, then shuffle.

Target creature gets -1/-1 until end of turn. Germinate. (Put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)

Whenever a creature you control dies, destroy target creature you don't control.

You draw X cards and you lose X life, where X is the number of cards in your graveyard.

Nameless Throng can't block.
{1}{B}, Exile an artifact or enchantment card from your graveyard: Return Nameless Throng from your graveyard to the battlefield.

Neckbreaker Viking gets +1/+0 and has menace as long as it's embattled. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Target creature gains deathtouch until end of turn. Regenerate it.

Mill three cards. Create a 1/1 black Skeleton creature token for each creature card milled this way. You draw a card and you lose 1 life for each noncreature card milled this way.

Enchant creature
Enchanted creature gets +1/+1.
When enchanted creature dies, you may exile it. If you do, return target creature card from your graveyard to the battlefield.

Creatures your opponents control get -1/-1 until end of turn. You gain 2 life.

Equipped creature gets +0/+2.
Whenever equipped creature blocks, you may pay {B}. If you do, target player loses 1 life.
Equip {2}

Deathtouch
When Nel Toth Shaman enters, mill two cards.

{1}{B}, Sacrifice another creature: Put a +1/+1 counter on Nemesis Eidolon. Draw a card. Activate only as a sorcery.

Neo-Soul Nihilist has lifelink as long as it's attacking.
When Neo-Soul Nihilist is put into your graveyard from anywhere, you may pay 2 life. If you do, conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

Deathtouch
When Neophyte of the Old Gods enters, rediscover a sorcery card. (Look at the top card of your library. You may reveal it and put it into your hand if it's a sorcery card. Otherwise, put it back or into your graveyard.)

Chronicle (As this enters and after your draw step, add a lore counter. Stop after III.)
[Lore I-II] Each player loses 1 life.
[Lore III] Create a 1/1 black Harpy creature token with flying.

Flying, trample
Nether Fiend enters with a lifelink counter on it.
{B}{B}, Pay 6 life, Remove a lifelink counter from Nether Fiend: Draw six cards.

As an additional cost to cast this spell, tap an untapped artifact you control.
Target player discards two cards.

Enchant opponent
You control enchanted player except during their extra turns.
At the beginning of enchanted player's end step, if it isn't an extra turn, they take an extra turn after this one.

Create a 1/1 white and black Badger Cleric creature token with lifelink. (Then exile this card. You may cast the creature later from exile.)