Mieddred, Lord of Annihilation

Whenever a creature enters the battlefield under
your control, you may have Mieddred, Lord of Annihilation deal damage equal to its power to
any target.
Whenever a creature leaves the battlefield, put X
+1/+1 counters on Mieddred, Lord of Annihilation, where X is that creature's
toughness.
Nothing escapes Mieddred.