Souldrinker

Ward {2}, Equip {3}, Equip Mutant {p/r}.

Equipped creature gets +1/+0, "{e}: Regenerate", and "{t}, Sacrifice a creature: Put a soul counter on Souldrinker. You get {e}{e}."

Whenever equipped creature deals combat damage to or fights another creature, you may remove a soul counter from Souldrinker; if you do, gain control of that creature.