Midnight Banshee is a rare Creature — Spirit card from Lorwyn Eclipsed Commander (ECC), collector number 80. Current market price: $0.22, 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.