As usual with Secret Lair pricing, the value proposition depends heavily on how much you care about alternate art, theme cohesion and Commander-friendly reprints rather than raw singles value
Oh man, there goes our Gem Mint rating
What's the difference between a mystery box and a booster box
The art and love for the roaring dragon is what gives this card its value, as it is regarded as a pretty awful card otherwise, with laughable attacks
Despite being unable to find any JP foil copies of Loam for sale with a quick Google search, I can tell you its typical sale price is about $180
If you ever have the opportunity to see a real Giratina V alternative full art in person, as a Pokmon fan you owe it to yourself to take a long look at it and fall into its memorizing realm of details and intricacies