Winnowing (Extended Art) [Lorwyn Eclipsed]

Description

Set:	Lorwyn Eclipsed
Type:	Sorcery
Rarity:	Rare
Cost:	{4}{W}{W}

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.