The Gitrog Monster You can make the argument for any version of The Gitrog Monster to be included here, but Im taking the classic
For example, you can preorder your Pokemon products and then pick them up the same day as release (assuming they are in stock)
Its also a natural fit in Quaquaval ex (PAL 52) , fueling Spiral Shot for a quick 230 damage and immediate reuse
You may be sacrificing customer service and ubiquity offered by the name-brand competitors, but in terms of sheer value, its hard to beat these sleeves
Promo cards remain incredibly popular and impactful on grading volume, and staples like Base Set Charizard and the Ancient Mew card continue to drive tons of submissions
It cant be destroyed or be targeted by card effects, giving it plenty of protection to stay on the board