Mirrodin's Unmaking

Convoke (Your creatures can help cast this spell.
Each creature you tap after you're done activating mana abilities pays for 1.)
Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating
mana abilities pays for 1.)
Soul craft (Your enchantments can help cast this spell. Each enchantment you tap after you're done activating mana abilities pays for 1.)
Exile the bottom X cards of each opponent's library.