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The Pokmon Trading Card Game (TCG) is one of the most recognizable and profitable TCGs ever made

The second is probably Jund

The ability to exchange one resource for another gives players plenty of choice on how best to use their creatures, lands, and spells to find winning combinations (more info on the theory behind that here)

This innovative online platform offers players a virtual realm where they can engage in strategic battles, trade cards with fellow enthusiasts, and participate in competitive tournaments

(You can also stick it in your inkwell.) Its a big cost, but one that comes with a lot of potential once you can afford it