I had been thinking of a Bolas EDH deck since around 2009, when Conflux was released.
It took me a while to finish the deck, the majority of the time being spent waiting for Nicol Bolas, the Ravager to be printed.
Then it took me some time to decide on how to actually build it, I was vaguely thinking spellslinger, but it all started coming together with the release of Thousand-Year Storm, A spellslinging storm deck? Themed around Bolas?
I could finally live the dream.
Mostly, you're looking to storm off with a proper storm card like Tendrils of Agony or Mind's Desire or build up a storm count with Thousand-Year Storm then cast something like Slave of Bolas, Choice of Damnations or Time Warp.
Omniscience and Enter the Infinite are in there for fun.
Or you can also ultimate a Bolas planeswalker, either by proliferating it or using The Elderspell to devour your other Bolases(Boli?) if you want to be particularly on-theme.
Decklist
Approximate Total Cost:
EDIT: Updated list.