Mental Misstep
Instant
Oracle Text
(
can be paid with either 
or 2 life.)
Counter target spell with mana value 1.
Rulings (7)
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Wizards of the CoastEach Phyrexian mana symbol in a spell's mana cost contributes 1 to that spell's mana value. For example, Mental Misstep's mana value is 1, regardless of how its cost was paid.
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Wizards of the CoastTo calculate the mana value of a card with Phyrexian mana symbols in its cost, count each Phyrexian mana symbol as 1.
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Wizards of the CoastIf a spell has
in its mana cost, X is considered to be the value chosen for it while that spell is on the stack.
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Wizards of the CoastAs you cast a spell or activate an activated ability with one or more Phyrexian mana symbols in its cost, you choose how to pay for each Phyrexian mana symbol at the same time you would choose modes or choose a value for X.
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Wizards of the CoastA card with Phyrexian mana symbols in its mana cost is each color that appears in that mana cost, regardless of how that cost may have been paid.
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Wizards of the CoastIf you're at 1 life or less, you can't pay 2 life.
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Wizards of the CoastPhyrexian mana is not a new color. Players can't produce Phyrexian mana.