msem-instigator

Flash
Enchant creature
Enchanted creature gets +2/+2 and has flying and “At the beginning of your upkeep, you lose 1 life and create a 1/1 black Harpy creature token with flying.”

{T}: Add {C}.
{T}, Sacrifice Ghost Quarter: Destroy target land. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle.

Unfettered Noble can't be blocked unless defending player pays 3 life, discards a card, or sacrifices a nonland permanent for each creature they control that's blocking it.
Sacrifice a nonland permanent: Unfettered Noble gains indestructible until end of turn.

Vigilance
When Olde King Koswe enters, reveal the top eight cards of your library. Put any number of permanent cards from among them onto the battlefield under an opponent's control, then put the rest on the bottom of your library in a random order.
At the beginning of your end step, gain control of target permanent you own.

{T}: Add {R}.
{R}, {T}: Target creature gains haste until end of turn.

Menace
Whenever you discard a card, Stillsong Enforcer deals 1 damage to target opponent or planeswalker.

Whenever you discard an instant or sorcery card, you may cast it from your graveyard. (You still pay its costs.)
Spells you cast from anywhere other than your hand cost {1} less to cast.

Each other Rogue creature you control enters with an additional +1/+1 counter on it.
Remove a +1/+1 counter from a creature you control: That creature can't be blocked this turn.

Enchant creature
When Flight of Fancy enters, draw two cards.
Enchanted creature has flying.

{T}: Add {C}.
{T}: Add {C} for each six cards in your graveyard.

Destroy all artifacts with mana value X or less. Whenever an artifact is destroyed this way, Calamitous Crash deals 1 damage to any target.

Other creatures you control get +0/+1.
Bulwark — {W}: Target creature gains lifelink until end of turn. Activate only if you control a creature with toughness 4 or greater.

Whenever Essence Rehabilitator perseveres, you may return target permanent card with mana value 2 or less from your graveyard to the battlefield. (A creature perseveres when it survives damage.)

Target player discards two cards unless they discard a noncreature, nonland card.

Target player loses 1 life. Scry 1.
Fabled {2}{B} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that player.)

Bloodprice {B} (You may cast this card by sacrificing a creature and paying its bloodprice.)
Destroy target creature.

Inscrutable Realms enters tapped unless you control two or more other lands.
{T}: Add {W}.
{T}, Pay 1 life: Add {G} or {U}.

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)
Whenever a creature you control becomes renowned, you may have it fight target creature you don't control. (Each deals damage equal to its power to the other.)

Target player discards two cards. Forebode. (Create a tapped colorless Omen artifact token with “{T}, Discard a card, Sacrifice this artifact: Draw a card.”)

Create three 1/1 green Saproling creature tokens.

Whenever you cast an enchantment spell, you may put target creature on the bottom of its owner's library.

Flying, prowess
If you would draw a card, scry 1, then draw a card instead.
Whenever an opponent casts a spell, if it's not their turn, draw a card.

Flying
Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
As long as Wings of Trust has three or more +1/+1 counters on it, it has lifelink and vigilance.

Target creature you control gets +2/+0 until end of turn. If that creature is attacking, you may aetherize it. (To aetherize, create a token that's a copy of it, then exile that token.)

Trample
Primitive Berserker's power is equal to the number of Goblins you control.