These ones have an interesting mechanic, Impending
Then that permanent's controller may sacrifice a land of their choice
The playtest version only cost one mana, but didn't have banding (or "stacks" as it was called)
These monsters are supported by the key part of the archetype, the normal effect monsters, such as Libromancer Agent , which recovers Libromancer cards from your GY
#21: Mindbug It would be tempting to rag on Magic: The Gathering creator Richard Garfield for being a one-trick pony, or opening Pandoras Box with the worlds first TCG, or just making what I hope is a crap-ton of money off the backs of cardboard fiends nose-deep in Secret Lairs if it werent for the very endearing fact that this man will not, can not stop making banger card games
Crowley, the Magistus of Grimoires X DARK Level 4 [ SpellcasterEffect ] ATK 1800 DEF 1000 You can send 1 Spellcaster monster from your hand or face-up field to the GY