Most important is, that you know why you die. Do you have bad draws? do you run out of specific quanta? Your deck is very similar to mine, but i dont have eternity so my deck is bigger, anyways i think that adding some sundials would be very helpful, number depends on you, but i think 6 would be ok. Sundial is that good because it is one more card, but you will use hasten to draw another + you will have one turn without damage. I will try to test your deck on trainer that we can upgrade it, also maybe additional boneyard could help for mutations
EDIT: I know why your last version is not working, you forgot to put in hourglasses! They are essential, put in two or three (if upgraded two will be enought). You need them to draw cards quickly
EDIT2: I dont have time for deep testing, but over 3 games, i had three elemental masteries, so this kind of thing works (wont be that good with unupped hourglass, but you upgrade them soon):
4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4sa 4vm 52n 52r 592 5c6 5c6 5f6 5f6 5f8 5oj 5ro 5rp 5rp 5rp 5rp 5rp 5rp 5up 61t 621 621 74b 7q5 7q5