Is Assemble the Rank and Vile legal in Standard, Modern, and Commander?

Assemble the Rank and Vile is legal in: no major formats. It is banned in: Legacy, Vintage, Commander, Pauper.

Assemble the Rank and Vile

Q: What type of card is Assemble the Rank and Vile?

Assemble the Rank and Vile is a Conspiracy. Its oracle text reads: "Hidden agenda (Start the game with this conspiracy face down in the command zone and secretly choose a card name. You may turn this conspiracy face up any time and reveal that name.) Creatures you control with the chosen name have "When this creature dies, you may pay {B}. If you do, create a tapped 2/2 black Zombie creature token.""

Conspiracy

Hidden agenda (Start the game with this conspiracy face down in the command zone and secretly choose a card name. You may turn this conspiracy face up any time and reveal that name.)

Creatures you control with the chosen name have "When this creature dies, you may pay . If you do, create a tapped 2/2 black Zombie creature token."