Not only are you playing 5-color good stuff, but youre also playing 5-color expensive stuff
It's extremely difficult to pull a Kaladesh Invention from a booster pack
This combination is proving almost impossible to beat, with twin Gardevoirs piling two free psychic energies per turn into Mewtwo EX, whose Psydrive attack for 150 HP (which ordinarily discards two energies per use, so takes some time to build back up) can then be used every single turn
Color complexity Magics five colors (white, blue, black, red, and green) have always been roughly balanced in terms of how many cards each gets
Then there are responsible group hug decks, which can be an absolute joy to play against
I know that is a more complex printing task to do, but MTGProxy passed that test with flying colors