Grist, Voracious Larva

Legendary Creature — Insect

Deathtouch
Whenever Grist or another creature you control enters, if it entered from your graveyard or you cast it from your graveyard, you may pay . If you do, exile Grist, then return it to the battlefield transformed under its owner's control.

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Grist, the Plague Swarm

Legendary Planeswalker — Grist

+1: Create a 1/1 black and green Insect creature token, then mill two cards. Put a deathtouch counter on the token if a black card was milled this way.
−2: Destroy target artifact or enchantment.
−6: For each creature card in your graveyard, create a token that's a copy of it, except it's a 1/1 black and green Insect.