You can triple Gamble for five base mana, but you can shave off a mana to let a foe discard and draw cards in a reverse looting effect (rummaging)
So if you can keep your commander in play you get benefits from your backgrounds, plus the powerful effects from cards like Skyhunter Strike Force for a massive melee, Tyrant's Familiar to burn off creatures, and Thunderfoot Baloth to finish opponents with a permanent, only slightly smaller Overrun
The relationship between total population, gem rate, and market value is nuanced and specific to each card, and the collectors who take the time to understand those relationships are the ones who make the best decisions about what to buy, what to submit, and what to hold
Yet it still could be very interesting since you can search for your infinite permanence, or other powerful trap cards like Skill Drain or There Can Be Only One
Depending on your deck, discarding a particular card may also allow you to activate that cards effect and kickstart a combo of your own
I have a few top chase PSA 10s on my list (that alt art Gengar VMAX from Fusion Strike will be mine this year), and will focus primarily on Scarlet and Violet and older PSA 10s