Hydroblast
Instant
Oracle Text
Choose one — • Counter target spell if it's red. • Destroy target permanent if it's red.Rulings (2)
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Wizards of the CoastThe decision to counter a spell or destroy a permanent is a decision made on announcement before the target is selected. If the spell is redirected, this mode can't be changed, so only targets of the selected type are valid.
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Wizards of the CoastHydroblast can target any spell or permanent, not just a red one. It checks the color of the target only on resolution.