Is Boulderbranch Golem legal in Standard, Modern, and Commander?

Boulderbranch Golem is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Boulderbranch Golem

Q: What type of card is Boulderbranch Golem?

Boulderbranch Golem is an Artifact Creature — Golem. Its oracle text reads: "Prototype {3}{G} — 3/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) When this creature enters, you gain life equal to its power."