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Discouraging play might happen and there is certainly a feeling to Soul Bound cards feeling icky but in fairness we are talking reward cards not cards that come out of purchasable packs. To me that is the key difference. I'm not sold on the idea but I do see the logic and potential benefits. Counter-point: it might actually increase play. This is because it would make sense to combine and MAX every reward card if they are Soul Bound. There would be zero reason to hold stacks of level one/two/three ect. It was also mentioned that once maxed they can be burned for DEC.