[@Ammokkx]

Well, I mean, There has been a high vote for super special card and cultural appropriation, So this means you sort of have a historical/legend basis for how everyone could have come to be drawn to this one place. You also similarly have the ease of producing forces counter to it (Ala Dark signers if you will) Meaning that it wouldn't be impossible to set up Shadow duels/Ante duels against the villians where the price is your super special awesome card.

The value you subject to them is up to you as GM.

Just a thought.