Instant, R (1) Choose one - Counter target spell if it's blue; or destroy target permanent if it's blue.1 "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.