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Your opponents can't cast spells with even mana valuesmana valuesZero is even.. (Zero is even.)
Your opponents can't block with creatures with even mana valuesmana valuesThe total amount of mana in a card's cost, ignoring colour. A card costing 
has mana value 4. X counts as 0 except on the stack..
Hover an underlined rule to see what it means.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
