As a lower level wizard (level36), I find it impossible to get past level 4. In fact, I can't beat level 4. I always either run out of cards ( yes, I am using Deckathalon 2 decks) or just can't beat them.
On the other hand, I LOVE the spiral events that have requirements to help other players by joining the team kiosk or visit homes and do tours. Frankly, I wish they kept the spiral events all year every day and simply added the other events. Please consider keeping the spiral events every day. It is much more beneficial to everyone.
i loathe deckathalon, and i am a max wizard. I don't think it's about level, it's about having a pet that heals every round, and getting through to a high enough level that you can use the specific deckathalon decks. Beyond that I can't figure out how to win.. except by chance.