Though the store is headquartered in Osaka, most of its branches are in Tokyo
Its not that interesting to play Constructed matches against the AI because they usually dont know how to use their deck properly
But the one green cost tends to price it out of most decks that usually want ritual spells, which limits its power level quite a bit
Like most Magic: The Gathering cards, the value of Duh depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Unhinged)
Leave them stashed in a closet, continuing to (hopefully) appreciate
This article focuses on: Price categories instead of gut feelings: Classification into Bulk, Playables, Staples, and High-End including examples of bulk purchase prices (Commons/Uncommons by the 1,000, Rares/Mythics per card)