Then there are limited-edition cards only obtainable by attending special events, entering contests, and competing in tournaments -- these are some of the most valuable cards a Pokemon collector can obtain
The real problem is with double protection (Great Sable Stag, Sword of X and Y, Mirran Crusader), which are very non-interactive and single-handedly win games against decks of those colors
To up the ante even further, Edgar Markov has a serialized variant that can be found in Collector Boosters
Grave Upheaval A mana value of 6 makes this an expensive reanimation effect in Commander, but Grave Upheaval can generate a lot of extra value by letting the creature attack that turn
Despite this, the value of Reshiram from Legendary Treasures is fairly steady at $232, with little movement recently beyond a random spike up to $248