Shiny Impetus is a uncommon Enchantment — Aura card from Murders at Karlov Manor Commander (MKC), collector number 161. Current market price: $0.30, TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +2/+2 and is goaded. (It attacks each combat if able and attacks a player other than you if able.) Whenever enchanted creature attacks, you create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")