those cards are pretty rare
unplayable, but maintains value
the ones that exist will fall into one of three main categories
old and nostalgic (juzam)
old and banned (lotus)
new and created as collectible (lotr)
also, the original "alpha" and "beta" variants of cheap cards tend to carry a premium - lightning bolt is a <$1 card, but a damaged alpha version is a few hundred bucks
originally, there were 3
rare
uncommon
common
then they added mythic
however, rarity tier won't give a good estimation of value, aside from maybe a ceiling
note the badgermole cub, both rated "M" for mythic (bottom left)
left one is about twice the price of the right because it's a borderless foil, while the right is the standard print
unlike pokemon in this regard which tells you the variant in the rarity
And rarity tears
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1PqgufE2YSYkUfx8cWQEbFExZMpNmnCTad Unverifiedif you're looking for a speculative bet, this might be worth a look
not sure what the population is, but it's the only foil version of any of the "banned for cultural offensiveness" cards, and you can find them for a fair amount cheaper than its Alpha/Beta counterparts
foils can be had for under $75 while the black border OG cards are in the hundreds
most similar cards (special foil of Alpha/Beta/early set) have seen the foils rise much closer to the OG value (Swords to Plowshares, City of Brass)
historical significance, resurgence in crusade-esque beliefs, might help here too
The black lotus is nice as simple as it is.. But I know it costs too much
super powerful
banned in all but "vintage" format I believe
and even there it's restricted (can only have 1 in deck, where you're allowed 4 of most cards)