House Tyrell. Non-Loyal.
Character. Cost: 4. STR: 4.

Knight.

Reaction: After you win a challenge in which Ser Mark Mullendore is participating, reveal the top card of your deck. You may put that card into play. If you do, place Ser Mark Mullendore on top of your deck (cannot be saved).

Ser Mark Mullendore brought a black-and-white monkey and fed him morsels from his own plate...
Federico Musetti
Music of Dragons #63.

Link: Decklists

Ser Mark Mullendore
Reviews

Rules FAQ

Events cannot enter play, so if Ser Mark reveals an event it remains on top of your deck and he remains in play.