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Your opponents can't cast spells with even mana values. (Zero is even.) Your opponents can't block with creatures with even mana values.
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 · 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.
Aug 25, 2015 · For creatures on the battlefield with {X} in their mana costs, the value for X is 0. Mistcutter Hydra (a creature with mana cost {X}{G}) could block, but Endless One could not.
Aug 25, 2015 · For spells with {X} 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 {X}) with X equal to 5, but not with X equal to 6.
| Archetype | Format | Inclusion | Copies | Decks (n) |
|---|---|---|---|---|
| Kinnan, Bonder Prodigy | cEDH | 17.6% | 1× | 17 |