This deck definitely pushes dependence on RNG pretty far, but overall, it is quite the FG farmer. I get plenty of long losing or winning streaks, but at the end of the day, I actually end up with more electrum than I started with (not counting any cards won).
With experience, you will be able to read your starting draw and your opponent's (by what he plays or with a precog), as well as what you can expect from the particular god, and judge whether you can play the voodoo and gravity pull immediately or wait and take hits directly with your health, allowing your voodoo to survive an extra turn or two so you can draw more BB's or TU's. Starting the combo earlier will result in a faster game and higher electrum reward for remaining health, while waiting may give you that one extra card needed to win at all.
Though it may seem like a luck-based slot machine to see if you get the combo quickly and beat the god, there is a lot of skill involved that can increase your win rate a good amount. Not to purposely sound cliché, but the best way really is to just stick with the deck and keep playing. Losing streaks will turn into winning ones, and you will not only get better at making decisions, but also making them quickly and cutting down your game time.