msem-instigator

Whenever one or more cards leave your graveyard, put a soul counter on this creature.
This creature gets +1/+1 for each soul counter on it.
{1}{W}, Exile a creature card from your graveyard: This creature gains indestructible until end of turn. Tap it.

Lifelink
When Ravenous Tarwurm enters, you may have it consume. When you do, destroy target creature with toughness 3 or less and you gain 3 life. (To consume, sacrifice another creature or exile a creature card from your graveyard.)

Flying (This creature can't be blocked except by creatures with flying or reach.)

Whenever you cast a noncreature spell, you may put a progress counter on Sovereign Skies.
[PROGRESS 2+] Indestructible
{T}: Add {C}.
[PROGRESS 9+] Sovereign Skies is a 9/9 Ship artifact creature with flying.

Target player discards two cards and loses 2 life. Scry 2. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Enchant creature
Enchanted creature is a blue Frog with base power and toughness 1/1 and loses all other card types, creature types and abilities.

First strike
Whenever this creature attacks, put a geode counter on target land you control. It gains “{1}, {T}, Sacrifice this land: Draw a card and you gain 2 life” for as long as it has a geode counter on it.

Creature tokens you control get +1/+0.

Transcend (Activate as a sorcery to gain the next type and a +1/+1 counter.)
Flash
When Atieh enters, return target noncreature spell to its owner's hand.
{W}{U}: Angel — You gain 2 life and draw a card.
{2}{W}{U}: Elder — Atieh gains “Each opponent can't cast more than one spell each turn.”

Discard your hand, then draw two cards for each land card discarded this way. For each opponent, Marzen's Frenzy deals damage to that player or a planeswalker they control equal to twice the number of instant or sorcery cards discarded this way.

Exile target creature or planeswalker, then for each counter on that permanent, you may put a counter of that kind on a permanent you control.

Menace
Whenever a creature you control deals combat damage to a permanent, that permanent's controller sacrifices it.

When Dusk Lieutenant enters, forebode. (Create a tapped colorless Omen artifact token with “{T}, Discard a card, Sacrifice this artifact: Draw a card.”)
Once each turn, when you discard a card during your turn, each opponent discards a card.

Whenever Passionate Painter becomes untapped, you may discard a card. If you do, draw a card, then transform Passionate Painter.

{T}: Add {C}.
{T}, Sacrifice a Clue: Draw a card.

Equipped creature gets +2/+2.
Whenever equipped creature attacks, until your next turn, up to one target creature can't attack or block and its activated abilities can't be activated.
Equip {2}

When Doomstep Giant enters, each player sacrifices a land.

Target player sacrifices an attacking creature.
Bulwark — That player sacrifices two attacking creatures instead if you control a creature with toughness 4 or greater.

Pressure {6}{U}{U} (You may cast this spell for its pressure cost if seven or more cards are in your graveyard.)
Take an extra turn after this one. If this spell was cast for its pressure cost, during that turn, whenever you tap an Island for mana, add an additional {U}.
Exile Cuxuri Rift.

Target creature gains hexproof and indestructible until end of turn. That creature seeks secrets. (Give it that Oath Aura. Fulfill it by attacking with it and two or more other creatures to draw a card.)

Enshrouded Village enters tapped.
{T}: Add {G}.
{1}{G}{G}: Until end of turn, Enshrouded Village becomes a 4/4 Human creature with trample. Activate only if you're horrific.

Menace (This creature can't be blocked except by two or more creatures.)
Whenever Mausoleum Revenant deals damage to a player, create a 2/2 black Zombie creature token.