Is Bastion Inventor legal in Standard, Modern, and Commander?

Bastion Inventor is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

Bastion Inventor

Q: What type of card is Bastion Inventor?

Bastion Inventor is a Creature — Vedalken Artificer. Its oracle text reads: "Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Hexproof (This creature can't be the target of spells or abilities your opponents control.)"