If you make a desktop game this hard and with such restrictions - you are hardcore games developer and will end up with no players. If you make it online and add a cash shop - hello, successful casual game developer!
there are millions combinations for all this stuff and somehow it's hard for me to have fun guessing 100 of them. especially if half of them doesn't make much sense.
add hotkeys for summoning (1-9) and it will be possible to complete this game just by holding "2"... its nothing compared to world domination. 1/5 just cos high expectations.
love this game. nice balance of cards, there is no best deck, there are only best decks against other decks.
but it's too much grind for upgrades. i actually thought that beating god let you upgrade one card for free, but... on the other hand, not much to do after you have all cards upgraded :)