Sir Gideon Ofnir, All Knowing

Your opponents can't cast spells with even mana values. (Zero is even.)

Your opponents can't block with creatures with even mana values.

Ahh, I knew you'd come. To stand before the
Elden Ring. To become Elden Lord.
What a sad state of affairs.
I commend your spirit, but alas, none shall take the throne.