Creatures your opponents control lose flying until end of turn if {G} was spent to cast Invert the Skies, and creatures you control gain flying until end of turn if {U} was spent to cast it. (Do both if {G}{U} was spent.)
Invert the Skies
Product Info: Eventide uncommon
Description:
Creatures your opponents control lose flying until end of turn if {G} was spent to cast Invert the Skies, and creatures you control gain flying until end of turn if {U} was spent to cast it. (Do both if {G}{U} was spent.)
Creatures your opponents control lose flying until end of turn if {G} was spent to cast Invert the Skies, and creatures you control gain flying until end of turn if {U} was spent to cast it. (Do both if {G}{U} was spent.)