I believe that it doesn't make too much sense to develop all the cards. There are some cards that I have never played so far and I don't believe that they will be necessary for my gameplay. I start to develop summoners and then some selected cards that I need.
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You will never know. These past few days I used one card I haven't developed at all and probably never will. And yet, it proved useful in a certain context. Strategies evolve, I've made the mistake of discarding many cards as not useful or not to be upgraded above a certain level in the past. That is until I met it in combat and that particular card I thought I shouldn't upgrade made the difference. The opponent had an extra ability or a higher attack power or higher life or speed, and that's how the battle history was written.