^Well, I don't know if that's a great idea... just some of the problems:
-MagneGatr/BlastGatr have very limited space as it is. Adding a large number of Totodile (more than needed usually), Bronzong G, Flint's Willpower, and DCE. Not to mention the entire donk engine: Lots of Uxie, Crobat G, PokéTurn, SSU, etc. that would otherwise not be present makes the late game very difficult.
-With either one, you would have a risk of starting out with another Basic, and having materials you need for the donk but having, say, Magnemite active isn't going to help.
-Basically, they're completely different decks that use completely different cards. It just doesn't work that well.