Argus, Big Game Hunter

You can't cast this spell unless you control 3 or more creatures with power 6 or greater. When Argus enters the battlefield sacrifice a creature then Argus gains X +1/+1 counters where X is that creatures power. Whenever a creature with power 6 or greater enters the battlefield draw a card. Whenever a creature with
power 6 or greater that was dealt damage by Argus
dies put a +1/+1 counter on it and draw a card.
All other creatures get +3/+3
Trample, Haste