Counterflux 
Instant
This spell can't be countered.
Counter target spell you don't control.
Overload 
(You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL