Had this idea. Originally, I wanted to try to make something that had "Devotion to Multicolor". After a few moments of thought, I figured this would be difficult to pull off. So, I made a God who worked off of ALL the colors. I didn't have too much trouble with this, but I'm not sure on the wording of the last ability. Help?
Devoid has no point being on a card that's supposed to show mastery of all five colors. Axe it to make the card simpler.
As fluffy said, the last ability doesn't work as intended because A) Who controls those permanents, then? and B) If we ignored the rule issue in A, then the cards are still hitting the battlefield anyway.
You might want to try something like "Your opponents cannot cast permanent spells of a color if your devotion to that color is greater than five." Same for the 2nd to last ability: "~ gets +1/+1 for each color that you have devotion greater than five in."
Lastly, while I get what this is going for, it seems kind of unfun once you hit enough devotions and your opponents can't do anything. I feel like this would result in games where it gets chump blocked a ton while you try to dig for that finisher card of yours and think the last ability should be something more interactive, but that's just my 2 cents.