As an example, Emchompite says that cards that were included within Japanese sets, like the Secret Rare Yveltal EX from Best of XY, but as promos in English, are usually more expensive in Japanese just due to the nature of their release (i.e., having to pull the card from a pack vs a guaranteed promo card in a product)
This particular copy is the Japanese version from the equivalent set named Birth Star
All of them are great ways for creature-based decks to gain life
All the complexity is still there, but it comes from combining these cards with other effects bouncing a modal land to your hand to use the other side later, searching for a creature card and being able to grab a utility landthat sort of thing
If a box of 12 packs is $200, then youre looking at about $9,500 of product to get one copy