Doctor Who Comic Strip Spoiler Concerning A Classic Master

Doctor Who Magazine's recent comic strip adventure concludes with Capaldi kickin Delgado's arse after they both absorb the god-like powers of a Time Shade. Delgado dscovers Twelve is from the future and there's some mumbo-jumbo about the family The Doctor has befriended having enough strength to deflect the artron energy back at Delgado and mortally wound him. He goes back to his TARDIS and swears revenge before he swiftly begins to regenerate ("What is death to me? I am The Master and life will obey me")

So how many official Delgado regenerations have we had now? I count Legacy of the Daleks as another one