This deck idea popped into my head while making an EDH deck that used a few combos like Kruphix+Prophet of kruphix+Hydras. The general way to play this deck is basically to start out small and just gain size through mana ramp and spells.
Although Mana gorger may not come in very handy late game, early game it is probably the best card in this deck. As the game goes on and the number of spells casted increases, It can get huge.
The reason that the Kruphix+Prophet of kruphix combo can be so powerful in this deck is because many of your spells are based off of raw mana costs. When you get to untap all of your lands during your opponents turn and then tap them all to add to your mana pool, your hydras can get pretty big. Especially savageborn Hydra which not only can you pay initial cost for it, but continue to build it up with the mana your get during your opponents turns.
This deck is especially great playing against multiple people because you untap lands during each of their turns, adding even more mana to your colorless mana pool.
If you have any ideas for other cards that I can implement to this deck to make it stronger, all suggestions are welcomed. Play test it first and then decide if you think your card would fit well into some of the combos.
On average when play testing against other decks I win on turn 8. Haven't lost yet!