Winnowing is a rare Sorcery card from Lorwyn Eclipsed Promos (PECL), collector number 43p. Current market price: $0.88 (foil $1.22), 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.) For each player, you choose a creature that player controls. Then each player sacrifices all other creatures they control that don't share a creature type with the chosen creature they control.