The Dark Illusion includes new monsters for Dark Magician Decks as well like the Magician of Dark Illusion Magicians Robe Magicians Rod and even a Toon Dark Magician that can Summon other Toons from your Deck
#4 Pot of Duality (Quarter Century Secret Rare) Set: 25th Anniversary Rarity Collection II Increase: +$13.23 Current Market Price: $22.33 As another QCSR (and one that, unlike Thestalos, does see competitive play currently), Pot of Duality was probably undervalued at less than $10
Not the only Doctor Who tie-in to do that (this was a Secret Lair, so its not officially a WHO card), but it certainly breaks the mold
When they catch up with Thomas, a fight ensues with Bakemon
4 Kroxa, Titan Of Death's Hunger Enough about crazy cards that are banned in some of the game's older formats though, let's get back to interactions in formats that most players are already familiar with
Theres also a visual appeal that might account for this, but the highest factor is the weighing aspect