Is Valiant Changeling legal in Standard, Modern, and Commander?

Valiant Changeling is legal in: Modern, Legacy, Vintage, Commander.

Valiant Changeling

Q: What type of card is Valiant Changeling?

Valiant Changeling is a Creature — Shapeshifter. Its oracle text reads: "This spell costs {1} less to cast for each creature type among creatures you control. This effect can't reduce the amount of mana this spell costs by more than {5}. Changeling (This card is every creature type.) Double strike"

Creature — Shapeshifter

This spell costs less to cast for each creature type among creatures you control. This effect can't reduce the amount of mana this spell costs by more than .