Mythical Slab lets you peek at the top card of your deck, but unlike Pokdex, lets you do something with it
GameStop does not offer market value for the resold cards, but the retailer does get rid of all the busywork of selling and packaging high-value cards
Originally, I wanted to build a giant, five-colored zoo deck featuring Vampire Bats, Manta Rays, Stampeding Rhinos, Mountain Goats, and Savannah Lions
Mega Greninja's existing fanbase keeps engagement constant even without viral pull moments.
You also need to make sure you hit your land drops, either with draw effects (Qiqirn Merchant and Adventurers Airship provide usable bodies as well as draw smoothing) or cards that directly give you lands or mana (World Map, landcyclers, Blitzball)
Once a card is graded, its also part of the companys database which makes replacement that much easier if its ever stolen