#4 The Gaffer Set: Commander: The Lord of the Rings: Tales of Middle-earth Increase: +$10.38 Current Market Price: $12.27 In retrospect, $2 was probably low for a three-cost commander who can draw four cards every turn cycle, especially one printed in the new pseudo-Reserved List that is Universes Beyond
AncestralMTG has an expansive collection of the cards listed here, as well as many more oddities and hidden treasures
It is also much rarer for fakes to let more light through than genuine cards
That said, the same data carries a warning that most of that money is spread across modest, repeatable sales, not headline-grabbing sales
Of course, there are also cards I didn't get
Kykar's limitation to trigger only on noncreature spells is hardly restrictive, given so many other available spell types