Is Helm of Obedience legal in Standard, Modern, and Commander?

Helm of Obedience is legal in: Legacy, Vintage, Commander.

Helm of Obedience

Q: What type of card is Helm of Obedience?

Helm of Obedience is an Artifact. Its oracle text reads: "{X}, {T}: Target opponent mills a card, then repeats this process until a creature card or X cards have been put into their graveyard this way, whichever comes first. If one or more creature cards were put into that graveyard this way, sacrifice Helm of Obedience and put one of them onto the battlefield under your control. X can't be 0."

Artifact

, : Target opponent mills a card, then repeats this process until a creature card or X cards have been put into their graveyard this way, whichever comes first. If one or more creature cards were put into that graveyard this way, sacrifice Helm of Obedience and put one of them onto the battlefield under your control. X can't be 0.