Emrakul, Prototype

Emrakul, Prototype cannot be countered.
Annihilator 4, Convert 4, Flying, Hexproof.
Emrakul,Prototype costs {x} less for every artifact, Phyrexian, or Eldrazi creature you control.
Whenever Emrakul,Prototype is destroyed or
exiled from anywhere, place it on the battlefield
with four time counters.
{2}{u}—Remove a time counter. This ability can
only be cast once per turn.