Disrupting Shoal #33
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Card Details
You may exile a blue card with mana value X from your hand rather than pay this spell's mana cost.
Counter target spell if its mana value is X.
Illustrated by Scott M. Fischer
Rulings (3)
Feb 1, 2005
Disrupting Shoal can target any spell, but does nothing unless that spell's mana value is X.
Dec 7, 2018
If a card in your hand has 
in its mana cost, X is considered to be 0.
Dec 7, 2018
If a spell has in its mana cost, include the value chosen for that X when determining the mana value of that spell, even if it was cast for an alternative cost and no mana was spent on X.
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