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I think Wintertusk is where things really began to get harder for me to solo...as in that's where I had to really modify my deck, strategy and accept that I would die sometimes. Some of the changes I made that helped a lot as a mage were as follows.

I set up two decks for myself one for minions and another for bosses, and as much as possible tailor them for whatever specific foes I am about to fight.

The minion deck is always around 15 cards and typically looks something like this 3 shields against enemy spell type (or tower shields), 3 sun enchants, 1-2 star spells (fortitude, amplify or vengeance depending on my mood/opponent), 2-3 meteor strikes, a dragon , a fire blade, an elemental blade and a reshuffle. In the event of something that likes tower shields I might add a couple of links or fire elves to keep them from shielding (and also because elves are AWESOME!) . Also if necessary I throw in a few prisms for fire types.

The boss deck I adjust based on the boss level, its minions, etc...so there is no firm strategy there.

The main thing to consider once you start hitting places like Wintertusk, Celestia and upwards is that the smartest thing you can do in round one is to shield as much as possible. Because everything starts out casting spells like Stormzilla and other high yield spells. Once they start running out of power pips they become much easier to handle, so the first few rounds are the most crucial for survival.

Its also a good idea around this time to start sacrificing some attack power for better resistance where necessary. Having 50% storm resist at the cost of 10% attack will save you in the long run. Also if you don't have a decent pet you need to try to get one trained...pets are the difference between death and victory way too often. My favorite pet skill is energizer battery...that skill has saved my life so many times I can't imagine having a pet without it.

Thank you for the tips guys, and I recently have just finished Hrundle Fjord on a limb of 63 health on the last battle. I am buying another deck for strategy. I have leveled up since I got into Austrilund. Now level 53, I believe. It has been much more harder. One of the quests, for Hod Mindseeker, was way to hard for the area. He was casting judgements almost every turn . With a minion of (yay me, none of my prisms ever come in my deck), they beat me out until a level 65 helped me out. It was ridiculous I couldn't beat a boss with 3,000 health, alone. Once he had 3 health and he killed me, I mean come on! Compared as have beaten bosses with 8,000 to 9,000 health (Joutun). There has been more team up action for help. I also just got to Vestrilund, but somehow the minions in the fields are much easier ranging about 1,252 health.
I too modify my deck way too often for the types of bosses there are in Wintertusk. Though most of them are , I still can't beat them. I find myself also using lots and lots of treasure cards. Also, I guess I do get too ticked off when I know I should have beaten it, but I didn't. I think you (goldenoak1) are right, I need to accept I'll die sometimes. I guess I go in too confident? I have also been getting way better gear. I used to have no resist or anything because all I would look for is health boost, but now, I have more resist than usual.
Farming gear is not really my thing, but I have been doing Mount Olympus over and over lately, getting reagents, and the boots of skyfire (those really boost my stats ). I have no experience in crafting, I've only finished the Wizard city and Krokotopia crafting quests. I do have 3 other lower level wizards (28 , 11 , 3 ) only one of which can access Marleybone for Waterworks. Thanks again, I'll use these strategies, and now I'm out of characters. Wonderful!

~ Alexis Walker, level 53