They are Routine-Instance-254, via r/MagicTCG from the Blind Eternities after all. On the other hand, the return of Wastes could be a subtle hint at major developments to come
The inspiration for this monster deck come from a variety of sources, including the Elder Scrolls series, the Diablo series, the original Warcraft Games, Dungeons & Dragons, and official Magic cards
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Firdoch Core is an interesting example of this in action: Its a dragon to behold Dispelling Exhale, it works with Roiling Dragonstorm, and its a demon for Unholy Annex // Ritual Chamber
It gains double strike until end of turn
However, due to the fast-paced releases in both video games and trading card sets during this time, WOTC decided to focus elsewhere, seeing as there were no more "trading card" focused Pokmon games in the works, and the second Trading Card Game in Japan lost momentum