Twinblade Slasher (EVE) from Eventide, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Trevor Hairsine
• Card Text:
  Wither (This deals damage to creatures in the form of -1/-1 counters.)
  1G: Twinblade Slasher gets +2/+2 until end of turn. Play this ability only once each turn.