After eating several steaks and absorbing magic, Bowser and Adagio are grown into giants, leaving the four heroes in trouble. Luigi and Fluttershy knew this is their big moment, so they aren’t afraid. With the power that flows into them in the dream world, they need to believe in themselves. So Luigi and Fluttershy focused on their magic and now are giants. Mario and Rainbow Dash are there for their support, including Dreambert. Go for it Giant Luigi and Fluttershy!  
Request by Super-Nick-2001.
 
Mario, Luigi, Bowser, Dreambert: Nintendo  
Rainbow Dash, Fluttershy, Adagio Dazzle: Hasbro  
Dreambert outline: MudSaw  
Rainbow Dash vector: ilaria122  
Fluttershy vector: jucamovi1992  
Adagio vector: Diegator007  
Background: Super-Nick-2001