Emrakul, eater of everything

Each colorless mana spent to cast this spell counts as {2}
When you cast Emrakul, exile all other permaments, then put a +1/+1 counter on it for each permament destroyed this way.
{c}{c}{c}{c}{c}{c}{c}{c}{c},{t}: Exile emrakul, then return it to the battlefield under it's owners control at the beggining of the next end step.
Flying, ward {4}{c},trample.