I 100% guarantee you that there is absolutely nothing you could do, whatsoever, that would provide you a better return on investment than getting this fusion champ. Zero.
Furthermore, with regards to your requirement of 35200, let's take that at face value. Assume you get 1000 energy for free every day, to be simple (the actual number is likely more). The fusion goes from the 3rd to the 16th, so 13 days. That means you get about a third of the required energy for free, just for playing the game.
The remaining amount you'll need to find other means to get, but there are quite a few of those which don't require spending money. Gems are the obvious avenue, but there's also clan gold you can use to buy refills, as well as Doom Tower.
If you haven't saved anything up at all, and you're a newer player, then yeah you may need to dip into your wallet - but $200 sounds like a lot more than you should need to spend. Personally I wouldn't know, as I've never spent any money on this game. But I reiterate my starting point - if you can get this guy, do everything in your power to do so. He is worth it.