Since M21, mill has become a keyword that appears all over Magic, especially on blue cards
Only one exists, and its printing plates were reportedly destroyed
I can promise you that Mark Rosewater is not going to teleport into your kitchen and shame you for proxying your Underground Sea rather than spending hundreds of dollars on a real copy
This theme works on three levels: Payoffs (i.e., Judge Magister Gabranth, Al Bhed Salvagers) Sacrifice outlets (i.e., Phantom Train, Namazu Trader, Ahriman) Fodder (Hecteyes, job select equipment, Rufus Shinras poor disposable dog) A good WB deck has a healthy mix of all three, plus lots of strong removal spells like White Auracite and Sephiroth's Intervention
Theres epic loot, fan-favourite characters from D&D lore and, as you can probably imagine, dungeons and lots of dragons
Theres some good stuff to be found here, though