While clones are already pretty good, they get even better when they can copy permanents of any type and when you can even choose from among what your opponents have in play
Melony #274 (Pokemon Japanese VMAX Climax | Pokemon Cards) prices are based on the historic sales
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In pretty much every case, the Showcase First-Place Foil (FPF) version of a given card is far more valuable than the regular version
What it's best for: Determining the true market value of virtually any card, especially vintage, graded, and rare promotional cards
Back when I was a teenager looking to pay for dates, I sold the majority of my Pokemon cards (many of which are worth many times more today than what I got out of them at the time)