Rogstavis, He Who Rots

Creatures you control have wither

If an effect you control would cause a creature to lose toughness, put that many -1/-1 counters on it instead

Once per turn when one or more -1/-1 counters are put on a creature an opponent controls, you may return a permanent card with mana value less than
or equal to the number of counters placed this way
to your hand.