Crawling Infestation
Self-mill decks usually want the graveyard for what they can pull back out of it: reanimation targets, delve fuel, flashback fodder. This one flips the incentive. The upkeep mill is the fuel, but the payoff triggers off any creature card hitting your graveyard from anywhere during your turn, which folds the two functions of a self-mill engine (filling the yard and getting value from it) into a single enchantment that asks for nothing else. Discard a creature, sacrifice one, let one die in combat, or just mill into one off the upkeep trigger, and the same 1/1 Insect arrives. Capping the token at one per turn is what settles the card into a grinding value role rather than an explosive one: a turn that dumps six creatures into the graveyard still nets exactly one body, so it never becomes a combo piece. The mill being optional matters too, letting you decline when your library is thinning toward danger. What you end up with is a passive board-builder that turns the graveyard from a resource you spend into one that quietly pays a small tax back to you every turn, a design that rewards decks already sending creatures to the yard for other reasons without demanding they build around it.
