msem-instigator

Creatures you control get +1/+1.
When Eternal Purpose enters, exile up to two target creature cards with mana value 3 or less from your graveyard. Return them to the battlefield under your control at the beginning of the next end step.

Enchant player
Whenever enchanted player casts a spell from anywhere other than exile, exile that spell. During that player's next turn, they may cast that card without paying its mana cost.

Enchant creature
Enchanted creature has reach. (It can block creatures with flying)
{G}, Sacrifice Ensnaring Vines: Tap target creature with flying.

Choose one or both —
• Exile target artifact.
• Put a -1/-1 counter on target creature.

Eureka! (At the beginning of each end step, you get a research counter if you cast a spell this turn. Then if you have eight or more research counters, remove them and create a Masterpiece token of your choice.)
Equipped creature gets +3/+2.
Equip {R}

Target creature can't be blocked this turn.

Menace
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)

Enchant creature
Enchanted creature can't attack, block, or crew Vehicles.

You gain 3 life. Whenever one or more creatures enter this turn, repeat that process.

{W}, {T}: Tap target creature.

Whenever a land you control enters, you may pay {1}. If you do, create a 1/1 green Saproling creature token.

Vigilance
When Tamaak Confidant enters, you gain 6 life if you control three or more Satrapies.

Flying, vigilance
At the beginning of your upkeep, if you control four or more Plains, put a +1/+1 counter on each other creature you control.

[+1]: Discard a card. If you did, draw a card.
[–2]: Create a Bullet token. Until end of turn, if a Bullet you control would deal damage, it deals that much damage plus 1 instead. (It’s an artifact with “{T}, Sacrifice this artifact: It deals 1 damage to any target.”)

Counter target artifact or sorcery spell.

Haste
Whenever Weary Sentinel attacks, you may pay {2}{R}{W}. If you do, it gets +2/+0 and gains first strike until end of turn.

When Bjarndyr Militant enters, return target Aura card or card with fabled from your graveyard to your hand.

Whenever equipped creature deals damage to a creature, that creature gets -2/-2 until end of turn.
Equip {2}

Flying (This creature can't be blocked except by creatures with flying or reach.)
Motivate 1 (When this creature enters, you may motivate target creature with less power than this by putting a +1/+1 counter on it.)

Pressure {G} (You may cast this spell for its pressure cost if there are seven or more cards in your graveyard.)
Deathtouch

{T}: The next time you would draw a card this turn, instead search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery.

Whenever a nontoken creature you control enters, if it wasn't cast, put a +1/+1 counter on Wretched Skulker.
{3}{W}, Sacrifice Wretched Skulker: Exile target nonland permanent with mana value less than Wretched Skulker's power.

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

Whenever a land enters under an opponent's control, that player loses 2 life and you gain 2 life.