Like most Magic: The Gathering cards, the value of Mountain depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Aetherdrift)
The exception: if you're building a full PSA 10 master set as a personal project, grade everything, but that's a passion project rather than an investment
There is a final round of supervision, used to refine the smallest details of the illustration and how it looks on the card
Sadly, since we cant predict the future, well just have to wait and see what happens
The Flood of Mars The Flood of Mars is a 3/3 with islandwalk that attacks and turns creatures into a copy of itself, or lands into an island in addition to their other types
Still, while the supply of misprints is growing alongside regular cards, the demand for these misprints is vastly outstripping it