There's some generally accepted terminology when classifying what type of cube you're building, based on the cardpool you're working with
Its also possible that, if were working so hard to enable Charnel Troll, we want some other Undergrowth cards, but Charnel Troll doesnt exactly play well with others
Like most Pokmon cards, the value of Mismagius GL LV.X 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 (Rising Rivals)
Playability-wise, however, theyre probably a lot better
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I think it warrants playtesting, as my gut says that using the usual graveyard recursion and buying stuff back with cards like Creeping Renaissance might just be better