Zeriam's power comes from the fact that it is self-propagating
This may very well be the best Cube for Spell Queller ever built, and I expect decks that are heavy on countermagic and flash threats are great in this Cube
The idea of establishing a bridge between the Innistrad and Ixalan vampires was certainly a valiant effort, but being able to create vampire tokens without ever casting your general from turn one forward was too potent
While these types of effects generally come in all sorts of varieties, here are a few things to keep in mind: Abilities will only change one set of types when changing subtypes
Its loyalty tokens can quickly stack up thanks to its mill-focused -1, which also synergizes well with mill and reanimation strategies
Its slightly concerning how many of them seem to be designed as value generators, given that Atraxa, Grand Unifier is essentially untouchable in that role and will likely be their fiercest competition for deck slots