Very limited print run or restricted distribution Low market availability Very popular characters Special versions (Manga, Gold, Super Parallel) Strong demand from collectors Conclusion In the One Piece Card Game, the most valuable cards combine genuine rarity, limited visibility, and the popularity of the characters
Few cards generate groans at a Commander table quite like Rhystic Study
There were also cloak cards in the MKM Commander precons, a couple as part of Alchemy: Murders at Karlov Manor , and one flavorful inclusion in Assassin's Creed
If people are picking and playing a card then it generally feels wrong to remove it.
If you manage to Surgical away both Grapeshot and Empty the Warrens, they probably cant find a win, sure, but only getting one isnt enough