Meltstrider's Resolve (EOE) from Edge of Eternities, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Carlos Palma Cruchaga
• Card Text:
  Enchant creature you control
  When this Aura enters, enchanted creature fights up to one target create an opponent controls. (Each deals damage equal to its power to the other.)
  Enchanted creature gets +0/+2 and can't be blocked by more than one creature.