Is Helitrooper legal in Standard, Modern, and Commander?

Helitrooper is legal in: Legacy, Vintage, Commander.

Helitrooper

Q: What type of card is Helitrooper?

Helitrooper is a Creature — Human Soldier. Its oracle text reads: "Flying Whenever this creature attacks, another target attacking creature gains flying until end of turn. Equip abilities you activate that target this creature cost {2} less to activate."