I don't think Five Color blue-white is gonna catch on. There is a new powerhouse in town. With commons like Harrow, Primal Growth, Quirion Elves, and Quirion Explorer, the uncommon cards Multani's Harmony and Elfhame Sanctuary, and the rare Utopia Tree, plus many more, green won't even really strain under this load. 5CG was always possible. In our current limited environment, people would just shake their heads at that.
Apocalypse makes it possible.
I hope you try other strategies. Without more knowledge on this new set, I can't elaborate much more. Also, keep in mind that these are just my thoughts on our newest obstacle to victory. I encourage you to formulate your own, and thank Pojo for a chance to let me write. I need somewhere to vent, and my house welcomes not the Magic.