Torrent of Stone is a common Instant — Arcane card from Modern Masters (MMA), collector number 137. Current market price: $0.14 (foil $0.40), TCGplayer market prices via Scryfall.
Torrent of Stone deals 4 damage to target creature. Splice onto Arcane—Sacrifice two Mountains. (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)