Dispersal Shield 
Instant
Counter target spell if its mana value is less than or equal to the greatest mana value among permanents you control.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Instant
Counter target spell if its mana value is less than or equal to the greatest mana value among permanents you control.