Archaon the Everchosen

When Archaon the Everchosen enters the battlefield, put a Corruption counter on
each creature you don't control.
At the beginning of your upkeep, Archaon the Everchosen deals 3 damage to target creature you
don't control with a Corruption Counter on it.
When Archaon the Everchosen attacks, you may
deal 3 damage to target creature with a
Corruption Counter on it.