'Grist' cards

As long as Grist isn't on the battlefield, it's a 1/1 Insect creature in addition to its other types. +1: Create a 1/1 black and green Insect creature token, then mill a card. If an Insect card was milled this way, put a loyalty counter on Grist and repeat this process. -2: You may sacrifice a creature. When you do, destroy target creature or planeswalker. -5: Each opponent loses life equal to the number of creature cards in your graveyard.

+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.