Surneer, Dark Physician

+1: Put a -1/-1 counter on up to one target creature and draw a card.
-2: Distribute a number of -1/-1 counters on any number of target creatures equal to the number of creature that already have a -1/-1 counter.
-5: Choose a creature with at least one -1/-1 counter, search its owner's library for any number of creatures with the same and exile them.