Random Incredibly Rare Pokémon Cards That Could Pay Off Your Student Loan Debt (18 items)

(#7) Black Triangle Error Booster Box

How Much It's Worth: Up to $8,700 for an entire sealed box

Why It's Worth So Much: Old booster boxes regularly sell for thousands on eBay because you don't know the kind of rare cards they might have. A triangle error booster pack is the single most valuable, and a box full of these runs for enough to buy a used car.

They were created when the factory was supposed to stop printing "first edition" booster packs but didn't. Instead, they covered the "first edition" symbol with a black triangle. The factory printed the mistake cards for only a few hours.

These cards are worth something only if they're inside the booster pack (about $250). When they're in a sealed booster box, however, they're worth even more.
(#6) Raichu
- Fictional Character
How Much It's Worth: Up to $10,000
Why It's Worth So Much: Though it's never been confirmed by Wizards of the Coast (the company that manufactures Pokémon cards), it's thought that just 10 Prerelease Raichu cards exist. The term "prerelease" was allegedly stamped on the base set card and given out only to employees, friends, and family.
(#5) Blastoise
- Fictional Character
How Much It's Worth: Up to $1,500
Why It's Worth So Much: Like every first edition shadowless base set holographic starter, Blastoise was extra rare in 1999, but it's even more coveted now. You'd be lucky if you find a PSA 9 card for less than $700.
(#8) Pikachu
- Fictional Character
How Much It's Worth: It's so rare you can't find it on eBay. The price is largely unknown, but it's sure to be exorbitant.

Why It's Worth So Much: No. 1, No. 2 and No. 3 trainer cards are always rare. They're only handed out to winners at official Trading Card Game world championships. This adorable, holographic Pikachu card was only given to four winners of the very first Japanese Pokémon Card Game Official Tournament; therefore it's the rarest.
(#11) Master Key Prize Card

How Much It's Worth: Up to $8,799.96
Why It's Worth So Much: There are only 34 copies of the Master's Key Prize Card in existence, as it was only given out during a 2010 trading card game tournament in Japan.
(#18) Chansey
- Fictional Character
How Much It's Worth: Up to $1,000, but commonly between $200 and $500

Why It's Worth So Much: If you happen to nab a first edition shadowless Chansey, you've got your hands on one of the rarest Pokémon cards in the original trading card game. Even if normal Pokémon are the second-most common in the game, this particular card was available only in the original 1999 base sets.