Deafening Clarion is a rare Sorcery card from Guilds of Ravnica Promos (PGRN), collector number 165p. Current market price: $0.42 (foil $0.50), TCGplayer market prices via Scryfall.
Choose one or both — • Deafening Clarion deals 3 damage to each creature. • Creatures you control gain lifelink until end of turn.