Ph'ala Paa, Mercenary Myr

Tap five Myrs: Add {w}{u}{b}{r}{g}.
Myrs you cast cost {1} less to cast for each nontoken Myr you control with a different names.
Whenever you cast a Myr, put a mercenary counter on Ph'ala Paa, Mercenary Myr .
{w}{u}{b}{r}{g}, remove five mercanary counters
from Ph'ala Paa: Destroy all non-Myr nonland permanents.