Rhaegar, The Devourer

Flying
Rhaegar, The Devourer comes into play with ten
+1/+1 counters on it.
Whenever Rhaegar, The Devourer attacks
or blocks, remove one +1/+1 counter from
Rhaegar, The Devourer at the end of combat.
{3}: Put a +1/+1 counter on Rhaegar, The
Devourer.