pokemon phantasmal flames booster box case Sleeved Pack Mega Lopunny ex Pokemon TCG Mega Evolution: Phantasmal

Some examples of this come in many different promo cards, like promotional Pikachus

Also, some Pokemon evolve and have various forms so you can explore coloring the different versions, making sure details such as symbols and evolution chains are noticeable

Sharuum the Hegemon Especially when paired with cards like Buried Alive, Sharuum the Hegemon can become a deadly reanimator Commander with the right build in mind

Like the Crystal Guardians Charizard, this also has a reverse holo that fetches quite a bit of money but the regular holo can be found on TCGplayer in Near Mint condition around $100-150

All three Meld cards are currently sitting around $10 a copy, and one of them even goes beyond the $20 mark