Battlefield Promotion is a common Instant card from Double Masters 2022 (2X2), collector number 7. Current market price: $0.12 (foil $0.23), TCGplayer market prices via Scryfall.
Put a +1/+1 counter on target creature. That creature gains first strike until end of turn. You gain 2 life. (A creature with first strike deals combat damage before creatures without first strike.)