Ahn-Riyel, Void Touched

As long as Ahn-Riyel, Void Touched is untapped, your opponents can't cast spells with even converted mana costs. (Zero is even.)
As long as Ahn-Riyel, Void Touched is tapped, your opponents can't cast spells with odd converted mana costs.
I've touched the truth of the multiverse, and now it haunts my every step.