Progenitus, Binder of Ancients

Progenitus, Binder of Ancients enters the
battlefield with 5 head counters on it, and it gets
+3/+3 for each head counter on it.
Progenitus, Binder of Ancients is all colors.
Whenever you cast a spell, if that spell is at least
one color, proliferate.
Progenitus, Binder of Ancients can't attack if your
devotion to any of the five colors is less than five.
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"The Ancients, including me, are done with Dominia.
I will try to convince Marit Lage the same."