The Card Master Challenge will appear every few weeks. In order to have even the slightest chance at holding my own, I usually save my resources by skipping 1 or 2 challenges, while stockpiling rewards in my inbox. Always keep rewards unopened in the inbox while saving. The reason we leave them unopened is that some items have a cap. For instance, once you hit 500k nixons, they cap out, and you stop receiving ones that you earn after reaching the cap. Wharf coins and giggitywatts also have caps. I'll attach an image of the scoring chart below. A good bit of points that you earn will come from arena battles. It's important to avoid auto-battling these arena duels, as you score points by playing, as well as winning the match. New legendary cards get you 500 points each, so those wharf coins should be spent on epic packs, with a 10% chance at a legendary. No matter how much you save, your chance of winning relies mainly on the leader board you are placed in. I like to refrain from spending during the first few days of the challenge in order to scope out the competition. If there are immediately players exceeding 100k points, I'll keep saving until the next one, and repeat the process. The giggitywatt converter can land you a ton of points, both from using the converter (250 points), and from the epic or legendary card received each time you use it (100-500 points). If you feel that you are up to the challenge, be prepared for hours of arena battles. The rewards are definitely worth the hassle. The higher ranks of this challenge can land you a bundle of super mythic stones, a legendary card, and even a mythic if you can take 1st place.
