It's better to be able to cast more spells later than to try and combo off when you dont have enough lands
Even if your deck doesnt go wide usually, this can still provide a solid buff, mix that in with any proliferate effects and now youre cooking with gas
Augur doesnt let you set the top of your library in the traditional sense, but it lets you see and play the top card of your library
The cycle is finally complete, and while Temple of Epiphany will certainly make a splash in Standard, I would say that for the short term at least it will be more impactful in Modern
In other words, there's little room for creative and different strategies, despite the Standard format now including a pretty large number of sets
Its a sacrifice outlet that will give you back the mana it took to cast it the first couple of uses