Is Memnarch legal in Standard, Modern, and Commander?

Memnarch is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Memnarch?

Memnarch is a Legendary Artifact Creature — Wizard. Its oracle text reads: "{1}{U}{U}: Target permanent becomes an artifact in addition to its other types. (This effect lasts indefinitely.) {3}{U}: Gain control of target artifact. (This effect lasts indefinitely.) *In the blur between metal and flesh, Memnarch found madness.* Power/Toughness: 4/5"