The deck is primarily built around Diabellstar the Black Witch, which currently serves as the only monster the archetype has to offer as of the release of Age of Overlord
It can also detach a material from itself to destroy as many cards as the opponent controls and gain 200 ATK for every card destroyed
I might try and get an ARS-10 Pokmon Web Moltres for my graded Moltres WotC #21 promo collection perhaps
It eventually ends with Sol'Kanar the Tainted being flickered under an opponent's control, but I like the idea of building in some flicker cards to keep it on my side of the battlefield
The second ability comes up far more often than I would have guessed initially, making blocks difficult as well as threatening lethal via trample during the late-game
Like most Pokmon cards, the value of Gloom depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (HSUndaunted)