Pyroblast | Magic: The Gathering
Formats Pyroblast is Legal in
Official Oracle Text for Pyroblast
—Jaya Ballard, task mage
Official Rulings for Pyroblast
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.