Is Manifold Key legal in Standard, Modern, and Commander?

Manifold Key is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Manifold Key

Q: What type of card is Manifold Key?

Manifold Key is an Artifact. Its oracle text reads: "{1}, {T}: Untap another target artifact. {3}, {T}: Target creature can't be blocked this turn. *"Finally! It was worth the price to never have to fiddle with lockpicks ever again." —Davvry Mineshadow, thief*"