Midnight Banshee is a rare Creature — Spirit card from Modern Masters 2015 (MM2), collector number 86. Current market price: $1.85 (foil $5.55), TCGplayer market prices via Scryfall.
Wither (This deals damage to creatures in the form of -1/-1 counters.) At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature.