Mana Rupture

Split second (As long as this spell is on the stack,
players can't cast spells or activate abilities that aren't
mana abilities.)

Destroy target nonland permanent you don’t control
with a mana ability. Each player loses all unspent
mana.

Overload {1}{b}{g}{u} (You may cast this spell for its overload cost. If you do, change "target" in its text
to "each.")