Is Secret Summoning legal in Standard, Modern, and Commander?

Secret Summoning is legal in: no major formats. It is banned in: Legacy, Vintage, Commander.

Secret Summoning

Q: What type of card is Secret Summoning?

Secret Summoning 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.) Whenever a creature you control with the chosen name enters, you may search your library for any number of cards with that name, reveal them, put them into your hand, then shuffle."

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.)

Whenever a creature you control with the chosen name enters, you may search your library for any number of cards with that name, reveal them, put them into your hand, then shuffle.

Set Conspiracy

Rarity Uncommon

Mana Value 0

Artist Lucas Graciano

Collector # 9

Scryfall