Is Amulet of Quoz legal in Standard, Modern, and Commander?

Amulet of Quoz is legal in: no major formats. It is banned in: Legacy, Vintage, Commander.

Amulet of Quoz

Q: What type of card is Amulet of Quoz?

Amulet of Quoz is an Artifact. Its oracle text reads: "Remove Amulet of Quoz from your deck before playing if you're not playing for ante.{T}, Sacrifice Amulet of Quoz: Target opponent may ante the top card of their library. If they don't, you flip a coin. If you win the flip, that player loses the game. If you lose the flip, you lose the game. Activate only during your upkeep."

Artifact

Remove Amulet of Quoz from your deck before playing if you're not playing for ante.<br>, Sacrifice Amulet of Quoz: Target opponent may ante the top card of their library. If they don't, you flip a coin. If you win the flip, that player loses the game. If you lose the flip, you lose the game. Activate only during your upkeep.