While visually striking, these are generally less valuable than traditional holofoil cards, unless part of a special edition or rarity pattern (like the Master Ball foil, explained below)
When a creature with backup X enters play, it can give X +1/+1 counters to any friendly creature -- including itself
That matters because it usually means: better flexibility (custom backs, version choices, one-off cards), pricing that can scale with order size, and turnaround that depends on production time + shipping transit time , not whatevers already on a shelf. ProxyMTG explicitly frames its model this way, including the practical breakdown of production vs transit (which is the difference between late and the label was created and USPS didnt scan it yet)
So in that scenario I would open and maybe grade them and then sell for max profit
Tezzeret, Artifice Master Tezzeret, Artifice Master is a Planeswalker that could fit into many formats that have powerful artifact decks in Modern-Vintage formats
