Originally inspired by @mendicant's Dichotomy Cube, and by a desire to use the Revised Black Knight and White Knight I played with as a kid.
There are several heavily signposted archetypes (Zombies, Vampires, Knights, Tokens, Flicker, Control, Sacrifice, Reanimator) as well as a few sub-themes (Humans, Lifegain). Each player gets as many swamps and plains as they want, plus up to four Scoured Barrens and up to two Orzhov Basilica. There are several daft, expensive cards, and so the tap-lands help to slow things down.
There is marked variance in the power level of the cards. This is for a few reasons. First, it contains some pet cards (see above). Second, it has only proxies/cards I owned at the time of creation. And lastly, who cares about winning when you can just try and do stupid stuff with questionable cards?