Is And They Shall Know No Fear legal in Standard, Modern, and Commander?

And They Shall Know No Fear is legal in: Legacy, Vintage, Commander.

And They Shall Know No Fear

Q: What type of card is And They Shall Know No Fear?

And They Shall Know No Fear is an Instant. Its oracle text reads: "Choose a creature type. Creatures you control of the chosen type get +1/+0 and gain indestructible until end of turn. *"They are my bulwark against the Terror. They are the Defenders of Humanity. They are my Space Marines." —The Emperor of Mankind*"