Prizefight (SNC) from Streets of New Capenna, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Deruchenko Alexander
• Card Text:
  Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.)
  Create a Treasure token. (It's an artifact with "T, Sacrifice this artifact: Add one mana of any color.")