Invert the Skies

Set: Eventide (#155)

Rarity: Uncommon

Type: Instant

Mana Cost: {3}{G/U}

Colors: Green, Blue

Creatures your opponents control lose flying until end of turn if {G} was spent to cast this spell, and creatures you control gain flying until end of turn if {U} was spent to cast this spell. (Do both if {G}{U} was spent.)