Midnight Banshee (SHM) from Shadowmoor, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Daarken
• Card Text:
  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.