Secret Summoning

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.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oejj4abu1pb1hpfcapy2e.