The Librarian

Put 4 Loyalty (use counters) on The Librarian. Opponents can attack The Librarian as though she were
you. Any damage she suffers depletes that much loyalty. If The Librarian has no loyalty, she abandons you.
Once during each of your turns, you may add or spend loyalty as indicated for the desired effect —
+3: Draw 2 cards
+1: Target opponent's enchantment or artifact, you now gain the effects of target as if it was under your control until your next upkeep.
-X: Return a creature with X ma