Snakeskin Veil is a common Instant card from Outlaws of Thunder Junction (OTJ), collector number 181. Current market price: $0.25 (foil $0.21), TCGplayer market prices via Scryfall.
Put a +1/+1 counter on target creature you control. It gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)