Oceiros, Consumed King

When Oceiros, Consumed King enters the battlefield, create a colorless 0/1 creature token
named Ocelot under an opponents control.
When Ocelot leaves the battlefield, put three
+1/+1 counters and a Trample counter on
Oceiros.
Whenever Oceiros attacks, you may discard a
card. If you do, draw a card.