Emissary of Grudges

Flying, haste As this creature enters, secretly choose an opponent. Reveal the player you chose: Choose new targets for target spell or ability if it's controlled by the chosen player and if it targets you or a permanent you control. Activate only once.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oijn2ddj7pb1h8cfmlrxp.