Dragonite ex Evolutions (Ultra Rare, 106/108) This majestic full-art Dragonite ex from the 20th-anniversary set is often overshadowed by other popular Pocket Monsters native to the Kanto region, leaving its price surprisingly low
Giant Adephage might seem like it should stay based on the size, but it really just ends up being a plain vanilla 7/7 creature if you aren't doing any token doubling
Attack Reflector: If the controller of Number 54: Lion Heart would take battle damage from a battle involving it, they can detach an Xyz Material from it as a cost to make the opponent take that battle damage instead
Cabal Coffers Flipped Itlimoc, Cradle of the Sun Nykthos, Shrine to Nyx Aside from accelerating you significantly, it can also untap lands that enter tapped, and provide you a second go on Maze of Ith and Spires of Orazca, among other effects
General Advice: To prevent any potential damage, always test your cleaning and maintenance techniques on a base card from the same set before handling more valuable cards like the 1st Edition Charizard
When building a deck, you can use a wildcard to "craft" any card of that rarity