Lurking Green Dragon 

Creature — Dragon
Flying This creature can't attack unless defending player controls a creature with flying.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Creature — Dragon
Flying This creature can't attack unless defending player controls a creature with flying.