Game changes constantly , new updates so you can then buy gems and coins to start creating cards and when you do they then not only change the catagory of that card but then make them limited so you cannot do a thing with them after , response to this is most are happy to have limiteds..the collections are updated repeatedly devaluing the rarity they know this yet refuse to admit for each new update means a flood of common limited so now your cards are devalued and trade set by Devs on disc