Repeated Reverberation is a rare Instant card from Core Set 2020 Promos (PM20), collector number 156p. Current market price: $0.61 (foil $1.00), TCGplayer market prices via Scryfall.
When you next cast an instant spell, cast a sorcery spell, or activate a loyalty ability this turn, copy that spell or ability twice. You may choose new targets for the copies.