Edges and Corners: The Silent Value Killers Whitening is the ultimate collectors nightmare
With Gogo, you can turn many of them into huge, game-ending threats
Wheel, there are some reasonable other choices like Magus of the Wheel, Reforge the Soul, Runehorn Hellkite and the medium-expensive Memory Jar
For collectors who simply wish to own an original Charizard without targeting investment, the Unlimited Base Set version in PSA 7 or 8 offers excellent value for money, allowing you to own a piece of Pokemon history for a few hundred euros
While this list does not include cards that are my personal favorite, like Fleetfoot Panther, Order // Chaos, or Thornscape Battlemage, it does include cards that I think are, objectively the strongest cards
Organize your cards by category, keep them upright in rows, and use cardboard dividers to separate sections