A-Bomb

Radiation (Whenever a creature enters the battlefield, if this card is on the battlefield or in your graveyard, put a Radiation counter on it.)
When A-Bomb enters the battlefield, destroy all creatures, artifacts, and 3 target lands controlled by each player. Then, sacrifice A-Bomb.
As long as A-Bomb is in your graveyard, creatures with Radiation counters on them get -1/-1.