Narroth'Til

This creature costs {x} mana, where {x} is the number of creatures in all graveyards plus the current life of its caster.
When this creature comes into play, all {w}, {u}, {r} and/or {g} creatures cannot defend against {b} or {c} creatures.
{t}{8}{p/b}- Destroy all enchantments on the battlefield.
When Narroth'Til exits the battlefield, all {w}, {u}, {r} and {g} creatures are destroyed. {t} all {b} and {c} creatures.
When Narroth'Til exits the battlefield, its caster's life is reduced to {0}
Narroth