Ancestors' Aid is a common Instant card from The Lost Caverns of Ixalan (LCI), collector number 132. Current market price: $0.29 (foil $0.38), TCGplayer market prices via Scryfall.
Target creature gets +2/+0 and gains first strike until end of turn. Create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")