Baleful Eidolon (THS) from Theros, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Min Yum
• Card Text:
  Bestow 4B (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
  Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
  Enchanted creature gets +1/+1 and has deathtouch.