Spellshattering Shield

Counter target spell you don't control.
Spellshattering Shield deals X damage, divided
as you chose among up to X targets, where X is
the countered spell's converted mana cost.
Gala ({4}{r}{u}{u}): (You may cast this spell for it's
Gala cost, if you do, copy this spell for any number of
valid targets.)
"Overwhelm the witch!"