There was a soundtrack piece playing in the episode 722 of One Piece. It started playing at 13 minutes and 54 seconds in. What is the name of that piece? It starts playing when Luffy rushes Doflamingo saying that once the latter's defeated, everything will be okay.
P.S. If the name of that song specifically is within another song (an example being the piece "Difficult" being composed of both the songs "Shichibukai" and "Mr. Prince"), please specify the song part specifically.