Avatar of Circular Reasoning

Flying, Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
Whenever a +1/+1 counter is put on a creature
you control, each player discards a card.
Hellbent -- As long as you have no cards in hand, Avatar of Circular Reasoning can't be blocked.