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

Cobalt Golem is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Cobalt Golem

Q: What type of card is Cobalt Golem?

Cobalt Golem is an Artifact Creature — Golem. Its oracle text reads: "{1}{U}: This creature gains flying until end of turn. *Centuries before the first tides of the Quicksilver Sea rose to meet each new sun, Mirrodin's light shone on the golems alone.* Power/Toughness: 2/3"