Pernicious Deed
Enchantment
{X}, Sacrifice this enchantment: Destroy each artifact, creature, and enchantment with mana value X or less.
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Rulings
16 Mar 2018
If a permanent has {X} in its mana cost, X is considered to be 0.
16 Mar 2018
A token has a mana value of 0 unless it is copying something else.
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