Wainwright, Corpse Collector

{2}{t}: If you do not control one, put a 2/2 colorless
Owl Construct creature token with flying and "Whenever you cast an instant or sorcery, gain 1 life." onto the battlefield.
Whenever a creature dies and is sent to the graveyard, create a colorless Corpse token with "{2}, Sacrifice this: Draw a card."
He uses the Bag of Holding purely to hold the corpses of his friends and foes.