Spellcounter

Split Second (As long as this spell is on the stack,
players can't cast spells or activate abilities that aren't
mana abilities.)
Treat target instant or sorcery opponent controls
as if it had Storm when cast. (They copy it for each
spell cast before it this turn. They may choose new
targets for the copies.)
"Yes, I'm sure that is what we wanted to do...
Quick question though: how do we make it stop??"