Besides the nova nurf, quantum pillars now give 3 random quantums (not just 2), and some weapons and whatnot have had their cost changed. You can still only have 6 quantum pillars max tho.
Nova just got nerfed - was -3 health, +2 all quantums, now is no effect on health, +1 all quantums. I'm guessing PvP style (level 4) will be more fun now. No more nova nova nova lyncanthrope graboid poison poison freeze freeze.
Want some experience winning? Start a Fire login. Sell all non-fire cards you can down to 30 cards. Get to 14 fire pillars and buy your way to six Fire Spirits (cheap!), six Fire Bolts (also cheap), 3 Deflagration. Destroy enemy shields/weapons/specials with Deflagration, firebolt enemy creatures ASAP, put down cheap fast-growing Fire Spirits whenever possible.
Great game ... Too hard?
Hint: First thing, sell various cards in your deck which are not in your element, and buy cards which ARE in your element. You'll want about 13 pillars of your element and some decent creatures / abilities.