Hour of Reckoning is a rare Sorcery card from Tarkir: Dragonstorm Commander (TDC), collector number 120. Current market price: $0.29, TCGplayer market prices via Scryfall.
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Destroy all nontoken creatures.