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But what if there is also a card that you can get after burning a certain amount of SPS?

Why not buy it and the token go to value the SPS DAO?

Because SPS burned is SPS forever gone, and we're already doing that with the mini-set.

Although the mini set is buyable with SPS, I don't think any of the tokens are getting burned. My understanding is that half goes to the company (steam monsters inc) and half goes to the SPS DAO.