Void Winnower
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Your opponents can't cast spells with even mana values.
Your opponents can't block with creatures with even mana values.
11/9
Illustrated by Chase Stone
Rulings (5)
Aug 25, 2015
Effects that increase or reduce the cost to cast a spell don't affect that spell's mana value.
Aug 25, 2015
For creatures on the battlefield with 
in their mana costs, the value for X is 0. Mistcutter Hydra (a creature with mana cost 
) could block, but Endless One could not.
Aug 25, 2015
For spells with in their mana costs, use the value chosen for X to determine if the spell's mana value is even or not. For example, your opponent could cast Endless One (with mana cost ) with X equal to 5, but not with X equal to 6.
Aug 25, 2015
The mana value of a face-down creature spell or a face-down creature is 0. Void Winnower will stop face-down creature spells from being cast and face-down creatures from blocking.
Aug 25, 2015
Yes, your opponent can't even. We know.
