Magic 2015 Core Set — Uncommon
Shrapnel Blast rulings:
7/18/2014 : You must sacrifice exactly one artifact to cast this spell; you canít cast it without sacrificing an artifact, and you canít sacrifice additional artifacts.
7/18/2014 : Players can only respond once this spell has been cast and all its costs have been paid. No one can try to destroy the artifact you sacrificed to prevent you from casting this spell.