how much is the most rarest pokemon card expensive ever sold? : r/PokeInvesting World's most expensive Pokémon card?

So what actually makes one card worth $2 and another worth $200,000

He resembles a giant boar with bear's claws

It allows you to sacrifice an artifact rather than a creature, but otherwise functions identically to emerge

It can also be 6/6 creature for only 4 mana once you have enough cards in the graveyard, with the ability to repeat its strong effect once it re-enters the battlefield and each time it attacks

These features could be wings, a halo, an extra set of arms, or some sort of pattern or symbol

Because it's a prototype, this card features different fonts, a missing water energy symbol, and misspellings - oddities which only makes the card more prized