Piety Charm is a common Instant card from Onslaught (ONS), collector number 49. Current market price: $0.11 (foil $0.53), TCGplayer market prices via Scryfall.
Choose one — • Destroy target Aura attached to a creature. • Target Soldier creature gets +2/+2 until end of turn. • Creatures you control gain vigilance until end of turn.