Thresh, The Chain Warden

Menace, Reach
Soul Collector-Whenever a creature an opponent controls dies, exile it with a soul counter on it.
Thresh gets +0/+1 for each soul counter on cards exiled this way.
Dark Passage-{1}{b}{g}, {t}: Return target creature card exiled with Thresh to the battlefield under your control. It gains "When this creature dies, exile it instead of putting it into its owner's graveyard."