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

Amoeboid Changeling is legal in: Modern, Legacy, Vintage, Commander, Pauper.

What type of card is Amoeboid Changeling?

Amoeboid Changeling is a Creature — Shapeshifter. Its oracle text reads: "Changeling (This card is every creature type.) {T}: Target creature gains all creature types until end of turn. {T}: Target creature loses all creature types until end of turn."