Sundering Stroke is a rare Sorcery card from Throne of Eldraine Promos (PELD), collector number 144p. Current market price: $0.13, TCGplayer market prices via Scryfall.
Sundering Stroke deals 7 damage divided as you choose among one, two, or three targets. If at least seven red mana was spent to cast this spell, instead Sundering Stroke deals 7 damage to each of those permanents and/or players.