The Three Musketeers deck support that's releasing in EX7 seems to have some identity issues as to how it wants to play. On one hand it had a full suite of digimon to make a sizeable stack, and on the other the low play costs seem to want the deck to agressively play out value to eventually overwhelm. I think the most important thing is to get to one of the Musketeers, ideally MagnaKidmon early, and Beelstar X for late game. The ideal board state with this would be BeelStar X with Shuu underneath it, along with a MagnaKidmon fighting alongside in order to perform massive security swings while utilizing the option suite for control.