Is Immediate Action legal in Standard, Modern, and Commander?

Immediate Action is legal in: no major formats. It is banned in: Legacy, Vintage, Commander, Pauper.

Immediate Action

Q: What type of card is Immediate Action?

Immediate Action 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 haste."

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 haste.

Set Conspiracy

Rarity Common

Artist Karl Kopinski

Collector # 5

Scryfall Gatherer