Cyrus, Galactic Boss

When Cyrus, Galactic Boss enters the battlefield,
each player exiles the top card of their library.
You may cast spells exiled with Cyrus, Galactic
Boss and spend mana as though it were mana of
any color to cast them.
Whenever you cast a spell you don't own, put a
+1/+1 counter on target non-Human creature
you control.