Return of Emrakul

Return of the Eldrazi enters the battlefield with
4 time counters on it.
Whenever you cast a colorless spell, remove a
time counter from Return of the Eldrazi. Then if
it has no time counters on it, create an 18/18
Legendary Eldrazi token named Emrakul, Wielder
of Insanity with Protection from colored spells,
Flying and Annhiliator 3