Volley of Boulders is a rare Sorcery card from Odyssey (ODY), collector number 227. Current market price: $0.24 (foil $2.52), TCGplayer market prices via Scryfall.
Volley of Boulders deals 6 damage divided as you choose among any number of targets. Flashback {R}{R}{R}{R}{R}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)