Super Secret Squirrel

When Super Secret Squirrel enters the battlefield, name a player and whisper “Super Secret Squirrel.”
That player can’t share information you give them with anyone else.
If they do, sacrifice Super Secret Squirrel and that player loses 10 life.
At the beginning of your upkeep, draw a card if no secrets have been broken.

“Not a promise. Just an irreversible, metaphysically notarized confidential covenant filed with the Ministry of Squirrel Affairs.”