I'm not even sure two Hourglasses belong in the deck. Yeah, it's great when you turn 2 double-nova hourglass and actually roll a time quanta or three with towers (and it doesn't get destroyed!), but how much often does that really happen? And how much less often would it happen with 1? Playing a second is nearly verboten barring really unusual randomness, and often I find my self cutting off usage after ~4 turns anyway. Really, what's the point of having it if you can't use it? Dodging that triple yellow card draw has a lot of value.
On the contrary, I find the Hourglasses pretty useful. I have my otys in the middle or end of the deck VERY often (i even lost against Neptune cos my first oty was the 9th last card in the deck). anyways protect artifact REALLY helps here. with it, i killed eternal phoenix (i lolled when he frractalled ash instead of phoenix) AND graviton on my first try.