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You can detach 1 material from an Xyz Monster you control
In any case, Umbreon VMAX Alt Art is a very expensive card right now, and considering its enchanting beauty, that's unsurprising
This wont matter in the early game, but it does play a great role in the mid to late game
If I were a Standard player running the Zur Domain deck, I'd do my best to find a spot for Yuna
Regardless, when you open a Japanese booster box, you are guaranteed to have at least some pulls, even if they arent the ones you wanted, and because all ARs are seeded the same as any other AR, manipulation of these card prices or highly inflated prices due to bad pull rates is almost impossible