Conspiracy

Secret Summoning

Hidden agenda (Start the game with this conspiracy face down in the command zone and secretly name a card. You may turn this conspiracy face up any time and reveal the chosen name.)
Whenever a creature with the chosen name enters the battlefield under your control, you may search your library for any number of cards with that name, reveal them, put them into your hand, then shuffle your library.

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.