Hour of Reckoning is a rare Sorcery card from Fallout (PIP), collector number 450. Current market price: $1.38 (foil $0.66), 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.