The One Ring

When The One Ring enters the battlefield, put a +1/+1 counter and 3 corruption counters on each creature your opponent controls.
Creatures your opponent controls have "At the beginning of your upkeep, remove a corruption counter from this creature. When the last is removed, your opponent gains control of this creature."
One Ring to rule them all, One ring to find them; One ring to bring them all and in the darkness bind them.