Uston, Slumbring Divine

Eminenece — The first time you cast a multicolored spell on your turn,
if Uston, Slumbering Divine is on the battlefield or in your command zone,
draw a card and put an Awakening counter
on Uston, Slumbring Divine.
If Uston, Slumbring Divine has ten Awakening counters on it, transform it and put it on the battlefield.