Harbin, Vanguard Aviator 
Legendary Creature — Human Soldier
Flying Whenever you attack with five or more Soldiers, creatures you control get +1/+1 and gain flying until end of turn.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL