msem-instigator

First strike

Target spell or permanent becomes colorless.

Sacrifice Moonlight Agent: Blocking creatures gain first strike until end of turn.

First strike
Other Harpies you control get +1/+1 and have first strike.
Whenever a Harpy you control dies, put a +1/+1 counter on Moonlight Stalker.

Untap target creature. Prevent all damage that would be dealt to that creature this turn. Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

When Morose Bohemian enters, scry 1, then draw a card.

Mosecf, the Sunseeker's Path enters tapped.
Whenever a creature you control attacks, put a creation counter on Mosecf.
{T}, Remove ten creation counters from Mosecf and sacrifice it: Creatures you control get +2/+2 and gain vigilance until end of turn. Activate only as a sorcery.

Deathtouch
Other creatures you control get -1/-1.
Whenever Mother Night attacks, put target creature card from a graveyard onto the battlefield under your control.

Whenever a creature dies, put a +1/+1 counter on Mother's Disciples.

Vanishing 3 (This permanent enters with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever a creature dies or a time counter is removed from Mourn the Lost, you may tap target creature.

({T}: Add {U} or {B}.)
Whenever Murmuring Falls becomes tapped, you lose 1 life unless you control two or more basic lands.

Haste
Whenever Nadei deals combat damage to a player, that player sacrifices a land. You may put a land card from a graveyard onto the battlefield under your control.

{T}, Discard a card: Draw a card.

Vigilance, deathtouch
Prevent all damage that would be dealt to Nataila, Raven's Repented while it's attacking or blocking alone.

{1}{G}: Night's Guard gets +2/+2 until end of turn. Activate only once each turn.

Whenever a creature dies, its controller loses 1 life.

Heretic (Whenever you cast a spell that doesn't share a color with this creature, it gets +1/+1 until end of turn.)
{1}{G}: Nightshade Slayer gets +2/+2 until end of turn. Activate only once each turn.

({T}: Add {B} or {G}.)
Whenever Nomad's Township becomes tapped, you lose 1 life unless you control two or more basic lands.

Primal {5}{G}{U} (During your turn, you may cast this spell for {5}{G}{U} instead of playing a land.)
If you cast this spell for its primal cost, search your library for a permanent card, reveal it, put it into your hand, then shuffle.
You may put a permanent card from your hand onto the battlefield.

Flying
Whenever Novean Sky Swallower blocks or becomes blocked by a creature with flying, destroy that creature, then put a +1/+1 counter on Novean Sky Swallower.

Enchant creature
Whenever you cast a green spell, enchanted creature gets +2/+2 until end of turn.

Whenever a creature you control dies, Oakpoint gets +4/+0 until end of turn.

Enchant creature
Enchanted creature can't attack or block unless its controller pays {3}.
Activated abilities of enchanted creature cost {3} more to activate.

Whenever Orria Mirrorpelt becomes the target of a spell, exile that spell. If Orria Mirrorpelt was its only target, copy it for each other creature target player controls. Each copy targets a different one of those creatures.

Primal {1}{G}{G} (During your turn, you may cast this spell for {1}{G}{G} instead of playing a land.)
When Orria's Ward enters, if you played a land this turn, draw a card. Otherwise, put two +1/+1 counters on it.