msem-instigator

Enchant creature
Embody (Enchanted creature is a copy of this card except for its types.)
Whenever Fate of the Weary becomes tapped, create a 0/1 black Spirit creature token with flying.

Put a +1/+1 counter on target creature, then you gain 1 life for each +1/+1 counter among creatures you control.

Harvest (You may tap any number of creatures you control as you cast this spell. If you do, reduce this spell's mana cost by their total power.)
Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. You gain 3 life.

{T}: Add {C}.
{T}, Pay 1 life: Add {G} or {U}.

Target opponent chooses up to one creature. Destroy the rest.

Whenever a creature an opponent controls dies, monstrosity 1. (If this creature isn't monstrous, put a +1/+1 counter on it and it becomes monstrous.)

Equipped creature gets +1/+0 and has “Whenever this creature becomes tapped, you gain 1 life.”
Equip {2}

Harvest (You may tap any number of creatures you control as you cast this spell. If you do, reduce this spell's mana cost by their total power.)
Each opponent sacrifices a nontoken permanent.

Forgotten Experiment can't be blocked.

Whenever a creature an opponent controls deals damage to you, monstrosity 2. (If this creature isn't monstrous, put two +1/+1 counters on it and it becomes monstrous.)
Frigid Behemoth can't attack unless it's monstrous.

{T}: Add {C}.
{T}, Pay 1 life: Add {G} or {W}.

Deathtouch
{B}{G}, Exile Frosted Adder from your graveyard: Return another target creature card from your graveyard to your hand.

When Frostfield Swordsman enters, arm it. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)

{1}{W}: Exile Furtive Witch. If you do, exile another target nonland permanent. Return both of those cards to the battlefield at the beginning of the next end step under their owners' control.

Whenever Gallant Chevalier attacks or blocks, put a +1/+1 counter on it and each other creature you control with a +1/+1 counter on it.

When Ghoulsaber enters, create a 1/1 white Spirit creature token with flying, then attach Ghoulsaber to it.
Equipped creature gets +2/+2.
Equip {2}

When Gilded Yak enters, you gain 3 life.

Defender
When Glacial Buttress dies, tap each creature that dealt damage to it this turn. Those creatures don't untap during their controller's next untap step.

{G}{U}: Glacier Tortoise gets +5/-5 until end of turn. Activate only once each turn.

Enchant creature
Enchanted creature has “You can't lose the game and your opponents can't win the game.”

Harvest (You may tap any number of creatures you control as you cast this spell. If you do, reduce this spell's mana cost by their total power.)
Target creature you control deals damage equal to its power to target creature you don't control.

Rapport — Whenever Grayce Blaen and at least one other creature you control become tapped, scry 1, then reveal the top card of your library. If it's a land card, you may put it onto the battlefield tapped.

{7}{G}: Monstrosity 6. (If this creature isn't monstrous, put six +1/+1 counters on it and it becomes monstrous.)

Greenheart Den enters tapped.
{T}: Add {G}.
{G}, {T}: Target creature you control gets +1/+1 until end of turn. Activate only as a sorcery and only if you control a green creature.