Ward.
Combo (3): Select an enemy follower on the field. Destroy it and summon a Fairy token on that follower's field.
QIf this follower's Fanfare ability destroys an enemy Mordecai the Duelist when the opponent's field is full and summons a Fairy in its place, can they still play the Mordecai the Duelist's Last Words ability?
AYes, they can. However, the Mordecai the Duelist cannot be put onto the field, so they would only be paying the cost.