I really love how they worked Norse mythology into the effects of these guys, especially Fenrir and Jormungandr. Too bad the deck is complete trash and, even among that trash, Fenrir and Jormungandr are a whole other level of awful.
Anyway, my answer is my main man Dark Paladin. Here's a photo of the one in my deck:
I was always a fan of Dark Magician, and I loved how Buster Blader could beat Blue-Eyes in a fight, so when I found out about Dark Paladin I was super stoked. I didn't actually manage to get one until years later, when I opened two when it was reprinted in Duelist Pack Yugi.
I've moved on to MTG now, but I still update my Dark Magician deck whenever I get the chance and Dark Paladin will always have a spot in it.
Also shoutouts to Apprentice Illusion Magician. Dark Magician Girl except with a much better, less fanservice-y design, and a really solid effect for Dark Magician decks.