I believe other things like soul bound cards that are locked per account and then can be unlocked with a DEC burn to be traded on the market has much more of a desired effect I think.
This sounds like a better idea to me than have the reward cards soulbound forever. We want to be able to upgrade these cards and depending on luck to have more isn't the best. I am up for the soulbound but give it some flexibility like you suggested could be a better option.
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Exactly and having to use DEC to unlock the card for the market already provides some essence of value to the card. I'd like to see it a little higher something like 10 DEC at least so it's a 1 cent value. of course higher like 100 might be better which would put each card at $0.10 value at least. Plus some of that will get burned and go back into the game. Lots of pluses there for a low cost.