This version, to this point, is the final printing of this iconic energy card and hails from 2018s Celestial Storm set
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Pushing your deck above 60 (or 40) cards makes it harder to find key cards, increases the risk of "mana flood" (drawing only lands, so you have nothing to cast) and "mana screw" (drawing too few lands, so you can't cast any of the spells in your hand), and makes it more likely that you'll draw unplayable hands
A long way to say MDFCs can help smooth out how much removal you have in your Commander deck, and how many lands your EDH decklist needs
Yes, it is free to enter a Pokmon Center and you dont even need tickets