Animar, Ikorian Behemoth

Creatures you control that have power 4 or greater have trample.
Whenever you cast a creature with converted mana cost three or less, put a +1/+1 counter on Animar, Ikorian Behemoth.
When Animar, Ikorian Behemoth leaves the battlefield, draw cards equal to the number of +1/+1 counters on Animar, Ikorian Behemoth.