msem-instigator

Deathtouch
When Necrodromos enters, put a +1/+1 counter on target creature.

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.

{3}{U}: Draw a card.
{2}{R}: Necropolis Battlemage deals 1 damage to target player. Scry 1.

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

Flying
Nectarkin enters with a +1/+1 counter on it.
Whenever Nectarkin deals combat damage to a player, permutate. (You may remove a counter from a creature you control. If you do, put two +1/+1 counters on a different creature you control.)

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

Choose a creature card name. Each player sacrifices a creature, then each player who controls a creature with the chosen name gets a poison counter.
Draw a card.

Counter target noncreature spell.

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.

When Neo-Alchemist enters, you may reappropriate. If you do, distribute two +1/+1 counters among creatures you control. Otherwise, put a +1/+1 counter on up to one target creature you control. (To reappropriate, exile exactly two cards from your hand and/or graveyard.)

Whenever Neo-Soul Attendant or another enchantment you control enters, you gain 1 life.

Whenever you gain life, put a +1/+1 counter on Neo-Soul Envoy.

When Neo-Soul Naturalist enters, exile up to one target artifact or enchantment. Its controller conjures a card named Data-Point into their hand. (It's a sorcery that costs {2} with “Draw a card.”)

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.”)

Whenever another enchantment you control enters, put a +1/+1 counter on Neo-Soul Prophet and conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

Neon Claw Assassin gets +1/+0 and has first strike as long as you've discarded a card this turn.

Whenever you discard a card, tap up to one target creature.

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.)

Colossal 2—{4}{G} (You may cast this for its colossal cost to have it enter with two +1/+1 counters; or pay {4}{G} as a sorcery: Put two +1/+1 counters on it if it has none.)
Reach

Flying
When Nest Matriarch enters, put a +1/+1 counter on another target creature you control. That creature gains lifelink until end of turn.

Nestled Delta enters tapped unless you control another Desert.
{T}: Add {G} or {U}.

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.