Is Metallic Mimic legal in Standard, Modern, and Commander?

Metallic Mimic is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Metallic Mimic

Q: What type of card is Metallic Mimic?

Metallic Mimic is an Artifact Creature — Shapeshifter. Its oracle text reads: "As this creature enters, choose a creature type. This creature is the chosen type in addition to its other types. Each other creature you control of the chosen type enters with an additional +1/+1 counter on it. Power/Toughness: 2/1"