Kyshtym, Living Meltdown

Flying
At the beginning of your upkeep, put a -1/-1
counter on each other creature.
Whenever a creature dies, if it had 0 or less toughness, it's controller creates a Nuclear Waste
token. (It's an indestructible artifact with "At the beginning of your upkeep, you lose 1 life." and
"{t}: Add one mana of any color.")