Incredibly addictive card game!
It's fun and addictive to search for different cards to collect and then upgrade by evolving them. Perhaps one downside is that it's hard to get higher level rare cards, without resorting to purchasing card packs in the game. You can enjoy the game without resorting to that, though.
The developers also do a decent job of creating extra quests and activities such as holy wars with ultra rare cards as rewards for ranking highly.
Also when you finish the tutorial, you can supply a referral code to get 100k rupies (a lot of in game cash to start) and a free rare card. Consider using my code ymb24985 to help us both out, as I'll also get a free rare and 100k rupies. If you message me in the game under the same username to let me know you've used my referral code; I'll send you half of the rupies I get, once I receive my bonus as well.