Stalking Leonin 
Creature — Cat Archer
When this creature enters, secretly choose an opponent. Reveal the player you chose: Exile target creature that's attacking you if it's controlled by the chosen player. Activate only once.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL