Lightfoot Technique is a common Instant card from Tarkir: Dragonstorm (TDM), collector number 14. Current market price: $0.18 (foil $0.31), TCGplayer market prices via Scryfall.
Put a +1/+1 counter on target creature. It gains flying and indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)