Kirtar's Wrath is a uncommon Sorcery card from Commander Masters (CMM), collector number 35. Current market price: $0.28 (foil $0.33), TCGplayer market prices via Scryfall.
Destroy all creatures. They can't be regenerated. Threshold — If there are seven or more cards in your graveyard, instead destroy all creatures, then create two 1/1 white Spirit creature tokens with flying. Creatures destroyed this way can't be regenerated.