Discard Doom

[Karrthus]

Discard Doom 100 cards, 0 sideboard 1 {Rakdos, Lord of Riots} 16 {Swamp} 1 {Reliquary Tower} 1 {Blackcleave Cliffs} 1 {Stensia Bloodhall} 1 {Rakdos Guildgate} 12 {Mountain} 1 {Rakdos Carnarium} 1 {Dragonskull Summit} 1 {Akoum Refuge} 1 {Blood Crypt} 36 lands 1 {Avatar of Woe} 1 {Olivia Voldaren} 1 {Ashenmoor Liege} 1 {Hypnotic Specter} 1 {Lavaborn Muse} 1 {Bloodhusk Ritualist} 1 {Tsabo Tavoc} 1 {Kederekt Parasite} 1 {Hellfire Mongrel} 1 {Abyssal Nocturnus} 1 {Grave Titan} 1 {Inferno Titan} 1 {Needle Specter} 1 {Fiend of the Shadows} 1 {Mindslicer} 1 {Sangromancer} 1 {Grim Lavamancer} 1 {Abyssal Specter} 1 {Okiba-Gang Shinobi} 1 {Kiku, Night's Flower} 1 {Guul Draz Specter} 1 {Order of Yawgmoth} 22 creatures 1 {Undercity Plague} 1 {Appetite for Brains} 1 {Hymn to Tourach} 1 {Dash Hopes} 1 {Sign in Blood} 1 {Reforge the Soul} 1 {Go for the Throat} 1 {Wild Guess} 1 {Auger Spree} 1 {Mind Shatter} 1 {Quest for the Nihil Stone} 1 {Painful Quandary} 1 {Rakdos Charm} 1 {Temporal Extortion} 1 {Damnation} 1 {Skull Rend} 1 {Dreadbore} 1 {Browbeat} 1 {Dismember} 1 {Underworld Dreams} 1 {Sever the Bloodline} 1 {Mind Rot} 1 {Slagstorm} 1 {Bloodchief Ascension} 1 {Profane Command} 1 {Liliana's Caress} 1 {Skullcage} 1 {Blightning} 1 {Liliana Vess} 1 {Terminate} 1 {Rakdos Keyrune} 1 {Syphon Mind} 1 {Rakdos's Return} 1 {Murder} 1 {Shrieking Affliction} 1 {Megrim} 1 {Breaking Point} 1 {Monomania} 1 {Mutilate} 1 {Assassin's Strike} 1 {Black Sun's Zenith} 41 other spells Sideboard

[Keyeto]

I like it!

How about a  {Otherworld Atlas}, {Temple Bell}, or {Howling Mine} type effect, to make sure your opponent(s) have something to discard (and this get hurt, from Megrim/Caress). Also, {Pain Magnification} might have a place here, and in my experience, {Memory Jar} with {Megrim} and {Liliana's Caress} on the field basically says "you win".

[Karrthus]

I need a memory jar. Never thought of that one. As for the draw artifacts, my play group uses those in almost all there decks. So I don't use them cause they will see play anyways lol