Hour of Reckoning

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.
"Ivory holocaust ashen pyre, three steeds ride forth of
wrath and ire. A reaping comes on foal's dead sire,
upon each crown accusing spire."
-Seer's Folly, Book II