Mono-Black Shirei deck:

Whenever a creature with **power 1 or less** is put into your graveyard from the battlefield, you may return that card to the battlefield at the beginning of the next end step if Shirei, Shizo's Caretaker is still on the battlefield.

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**NEED ENCHANTMENT/ARTIFACT REMOVAL

Abyssal Gatekeeper: decent groupsac, plus it will return with whatever I sac.
Armor Thrull: boost Shirei and then come back.
Apprentice Necromancer: Retrieval for any valuable pre-Sherei creatures.
*Ashen-Skin Zubera - Eh. 1discard1.
Augur of Skulls - 1discard2 upon self-sac.
Basal Thrull - self-sac for BB in manapool.
*Basilica screecher - extort may be fun.
Big Game Hunter - destroys a 4+ power creature upon entry.
Bitterheart Witch - free curse upon death. Also has deathtouch.
Blighted Shaman - sac-any for temporary boost.
Blood Artist - whenever it or another creature dies, extort. $1.
Blood Pet - non-tap sac to add B to pool.
Bloodflow Connoisseur - sac creatures for +1/+1 counters.
Bogbrew Witch/Festering Newt/Bubbling Cauldron - Cauldron is simple sac outlet with huge upside if I get a newt, festering newt is a good one to kill, and witch is a good way to call them up. Bonus: all are 1/x.
Boneshredder - destroys nonartifact/nonblack upon entry, and echo cost will keep it returning until I want to lay it to rest. Can't hit my creatures.
Brain Maggot - can't self-sac, but upon entry lets me see opponent's hand and temp-exile a card.
Brain Maggot  - sac to 1discard2.
*Cabal Interrogator - partial thoughtseize, but there are better ways to do this.
Cabal Trainee - gives a creature -2/-0. Easy way to keep them from boosting my creatures before they hit the graveyard.
Chimney Imp - okay semidiscard. Has to graveyard.
Corpse Blockade - sac outlet, great deathtouch wall.
Corrosive Mentor - Group wither!
*Corrupt Court Official - Hahah, mild effect but hilarous art. BUT it's $8.
Crowd of Cinders - Since nothing is going away, this will get huge quickly! and Intimidate.
*Dauthi creatures - didn't include, but interesting possibilities with Shadow.
Deathgreeter - +1 life from creature death.
Deathknell Kami - Soulshift, 2-mana boost with flying.
Disciple of Griselbrand - sac(1) to gain life of toughness
Disciple of Phenax - basically thoughtseizes upon entry.
*Drainpipe Vermin - B to 1discard1. Decent.
*El-Hajjâj - give the poor guy a chance haha.
Flensermite - infect/lifelink.
Fume Spitter - self-sac for -1/-1 Counter.
Giant Scorpion - deathtouch.
Gnat Miser/Cursed Rack - Opponents get smaller hands!
Grim Guardian - opponents lose 1 life.
Guiltfeeder - Intimidate, then defending player loses life for each card in graveyard.
Guul Draz Vampire - possible fun finisher.
*Headhunter - just a goofy looking card!
Hell's Caretaker - Can get back something that I'm missing. Also a decent blink/sac outlet. $4
Insidious Bookworms - 1discardRANDOM1 for 1B on death.
Kiku, Night's Flower - 2BB tap for creature self-damage equal to power.
Liliana's Shade - ETB swampsearch, boostable.
Maggot Carrier - ETB grouploss.
Marsh Flitter - ETB 2 goblins!
Mindlash Sliver - 1/sac to groupdiscard1.
Mortician Beetle  - when sac, gets 1/1 counter
*Necroskitter - good but $4
Nettling Imp - force to attack if possible, but if it can't then destroyed.
Nezumi Bone-Reader - B/sacany to make 1discard1.
*Norritt - force to attack. Also amusing.
Noxious Toad - HYPNOTOAD!!! also ETG Alldiscard1.
Pharika's Chosen - Cheap deathtouch.
Phyrexian Gremlins - easy way to deal with artifacts.
Plague Stinger - flying/infect
Plagued Rusalka - mild sac outlet
Pulse Tracker - opponents -1 life when attacks.
Ravenous Rats - ETB 1discard1.
*Returned Reveler - ETG, all put 3 from library to graveyard.
Ruthless Ripper - 1/1 deathtouch with fun.
Scavenger Drake - Boosts with sac's.
Shadow Alley Denizen - gifts intimidate when another ETB.
*shadowborn apostle - okay, this could get stupid. And expensive.
Skirsdag High Priest - Easy to get 5/5 flyers!
Soldevi Adnate - NECESSARY mana generator.
Sorceress Queen - Can easily save me from a boost-kill.
Spiteful Returned - defending player loses 2 life
*Suq'Ata Assassin - Goofy intimidate/poison.
* Swamp Mosquito - another goofy flyer/poison.
Thoughtpicker Witch - look at top 2 of opponent's library, exile 1. Fun way to mess with someone.
*Thrull Parasite - Fun way to remove counters.
Thrull Surgeon - 1B sac/thoughtseize.
*Uncle Istvan - Creepy uncle.
Viscera Seer - Sac to scry1.
Wall of Souls - A wall that hurts back!
Wei Scout - Because horsemanship.
Whispering Specter - Another ridiculous poisoner.

Removed b/c money:
Kiku, Night's Flower $1
Guiltfeeder $1
Blood Artist $1
*Necroskitter
*Corrupt court official
*Black Market