Even with the apparent rarity of these cards, the basic rule of economy is supply and demand. Having limited supply should only drive up the price when there is a large, or increasing, demand. I don't think there is a demand for this card other than 'oh wow, I've never seen that so I should buy it', so I think the price of $250 is a bit steep. Perhaps the reserve is much lower than that, low. But I definately wouldn't pay more than $50 for this just because, although rare, I know nothing about it. For all I know it's just a normal deck painted black on the back.