Having grown tired of, perhaps even embarrassed of, my wholly unoriginal Baral Polymorph concept, I had to put together a deck from the ground up. I chose Liliana, Heretical Healer. I wanted to represent two effects extremely well: "each x sacrifices" and "each x discards". X can be player or opponent. I wanted a game plan that looked for less represented cards in the format. Generally, I hope to just +Lili and shoot for the emblem before I start doing a mix of + and - for the real value. I didn't want any of my effects described above to come from combat triggers - they're predominantly ETB, with a smattering of LTB for good measure. I didn't want to risk losing a card to removal before it hit all my opponents, so all of my effects hit everyone simultaneously -- it conspicuously avoids cards like the genre namesake Smokestack. The win condition is black's trademark variety of life-drain, albeit typically on a bleeder scale and not a blow-out, big mana finish. I didn't go into building this deck with a budget, and I didn't choose or not choose any cards with price in mind. I just used Gatherer and plopped in "each player/opponent sacrifices/discards" and went from there. The deck ended up insanely budget -- under 100.
1 Liliana, Heretical Healer
Creature
1 Blood Artist
1 Noxious Toad
1 Mindlash Sliver
1 Rotting Rats
1 Abyssal Gatekeeper
1 Deathgreeter
1 Zulaport Cutthroat
1 Burglar Rat
1 Cackling Fiend
1 Earsplitting Rats
1 Cunning Lethemancer
1 Sibsig Icebreakers
1 Butcher of Malakir
1 Liliana's Specter
1 Miasmic Mummy
1 Falkenrath Noble
1 Screeching Buzzard
1 Merciless Executioner
1 Sangromancer
1 Fleshbag Marauder
1 Plaguecrafter
1 Mindslicer
1 Vindictive Lich
1 Slum Reaper
1 Myojin of Night's Reach
1 Patron of the Nezumi
1 Words of Waste
1 Bloodchief Ascension
1 Painful Quandary
1 Grave Pact
1 Exquisite Blood
1 Dictate of Erebos
1 Creeping Dread
1 Oath of Liliana
1 The Eldest Reborn
1 Thoughtrender Lamia
Land
38 Swamp
Instant
1 Perilous Predicament
1 Vona's Hunger
Sorcery
1 Pox
1 Strongarm Tactics
1 Death Cloud
1 Tyrant's Choice
1 Reign of the Pit
1 Bite of the Black Rose
1 Dark Deal
1 Tasigur's Cruelty
1 Killing Wave
1 Delirium Skeins
1 Torment of Hailfire
1 Capital Punishment
1 Unnerve
1 Syphon Flesh
1 Syphon Mind
1 Smallpox
1 Innocent Blood
1 Barter in Blood
1 Arterial Flow
1 Virtus's Maneuver
1 Fraying Omnipotence
1 Skull Storm
1 Vicious Rumors