Archon of the Unknowable

Colorless spells with converted mana cost 6 or higher cost {2} less to cast.
Whenever you cast a colorless spell, gain life equal to that spell's converted mana cost. If you gain 9 or more life this way, exile Archon of the Unknowable.
"Look past the veil of reality. You will find them, the truths none shall ever know."