for MCBC +1 ability ... the master cards which are protected

[ultra]

do these mean only your persona specific Master or any master card in your deck?

here is sample:

Play in conjunction with the Ramirez Persona. You begin the game with +1 Ability. Your Master Cards cannot be countered or removed from the game by your opponent. 

so what does the "Your" Master Cards ... refer to?

[dragothebreaker]

All master cards in your deck - I believe to include even ones you take