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Yeah, they must buy rebellion..

And the fear will remain... What'll happen to rebellion after it drops from modern, right?

Yeah, this is not inspiring people to invest. I dont know if it is just a thing for Splinterlands or all card games.

I've heard that other cards games has this dual format thing, but I didn't search about it to be 100% sure...

usually when the older card get nerfed with new sets because of power creep.

That true, the newer cards have some OP abilities for example Weapons Training that changed the Splinterlands meta and its from newer sets.