I'd hypothesized about building a Kestia, the Cultivator hexproof/indestructible deck but never put it together. Kestia gives you card draw and a consistent buff effect out of the command zone, and you can run enchantment creatures and other auras to increase your card draw. She's also in the best colour combo for both hexproof creatures and creature buffs (Rafiq of the Many, Finest Hour).
Kestia's bestow ability also makes your board resilient against wraths.
You'd likely want to run a decent amount of ramp due to Kestia's fairly expensive bestow cost, as well as many of the better hexproof dudes (Carnage Tyrant, Sagu Mauler) being pretty expensive mana-wise. Ramp can also help fix your colours, so it's less of an issue that you're running 3 colours.
Kestia's bestow ability also makes your board resilient against wraths.
You'd likely want to run a decent amount of ramp due to Kestia's fairly expensive bestow cost, as well as many of the better hexproof dudes (Carnage Tyrant, Sagu Mauler) being pretty expensive mana-wise. Ramp can also help fix your colours, so it's less of an issue that you're running 3 colours.