If you want to draw cards in Pox, our choices are limited.
Lands:
Geier Reach Sanitarium - Best with Chains of Mephistopheles or hellbent opponent.
Sea Gate Wreckage - Neat but not super reliable due to activation restrictions that tend to work against each other. Colorless mana makes it difficult to cast BB spells which makes it harder to empty your hand.
Artfact/Enchantments:
Bottled Cloister - Never tried it. Seems super solid when you want CA and need hand protection.
Phyrexian Arena - Might be the best non-walker option, but it is always difficult trying to justify something that does nothing the turn you cast it. Super sweet off a Ritual.
Underworld Connections - Worse than above, but can be utilized immediately for the price of 4 mana and 1 life. Able to not accidentally kill yourself but this either screams "Wasteland me!" or ties up a Swamp that you need to cast the spells you draw. Sucks on turn 3.
Waste Not - Conceptually awesome but is a lot of effort for things you can't control. Seems like a pipe dream.
Walkers:
Karn, Scion of Urza - King Karnadvantage. Ever since Karn came around I feel more confident in my deck. The 2-of draws and filters and distracts and can close out games.
Ob Nixilis, Reignited - I played Ob Nix for a little while in the board and even once or twice in the main. He does everything you want but 5 mana can be pretty hard to achieve consistently.
Spells:
Don't. As pointed out recently, Lily is going to eat your hard work.
Creatures:
Dark Confidant - Might be the only decent solution on a stick. Seen in Reid Duke sideboards.
Asylum Visitor
All valid points. If a creature doesn't pass the Innocent Blood test we can't play it. The exception of course is our delving Demons. Although if you need to cast IB with one of the big boi's out, he is probably outclassed by a bigger boi. Every creature in our format (save Xantid Swarm?) kills Visitor in combat. It's cute that (through Madness) it synergies with the 1st Smallpox, but that's about it.

