This concept alone is incredibly intriguing, and it is a shame that the West can't experience it without a translated emulation
It is not until you are killing them with it a few turns later that they bother to properly read it
With Sonic and a few other creatures in play, you can use Cinderclasm to make a small mountain of Treasure tokens at the end of your opponent's turn, leaving them little time to respond.
The practical takeaway sits one tier down: the affordable cards, like modern chase cards, tend to be cheapest and most available in Japan, the very market that produced the grails in the first place
As for the Duals, its easy this week: We got a playset of EACH including Underground Sea and Volcanic Island
This is not investment advicebuy what youll be glad to own regardless of where the market goes