3 god yugioh cards PSA10 Yu-Gi-Oh! Three Phantom Gods Prisma Consecutive 3-Card Set ‐ Mercari Japan: Shop from Japan Not tournament legal! Yugioh Limited Edition Ultra Rare

Most TCGs suffer from some power creep, where each new set is a little more powerful than the previous one

Escape Rope Escape Rope is another powerful trainer card leaving the standard format

Add in the rarity of rainbow cards and this Tag Team GX was very sought after, being propelled to comfortably the most expensive card in Unified Minds

The condition of a card is also important

And then on Old Fogey, we see that the Time Machine has crashed (Goblins aren't the best pilots)

When a Pokmon is under the Poison status condition, it takes 10 damage at the end of every turn for each Poison counter on the card, which can be enough damage to knock out a significant number of low HP Pokmon