Instant, R (1)
Uncommon
Choose one — Counter target spell if it's blue; or destroy target permanent if it's blue.
"Just the thing for those pesky water mages."
—Jaya Ballard, task mage
Illus. Kaja Foglio

10/4/2004: The 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.
9/16/2007: You can change the text of this spell after announcing it to change the color that it will affect. This works, because the color isn't part of the targeting requirement.
9/16/2007: Note that Pyroblast can target any spell or permanent, not just a blue one. It checks the color of the target only on resolution.
9/16/2007: If there are no legal targets for either of the modes, you can't choose that mode.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander