Are you sick of the same old boring aggro decks? The same old boring midrange decks? Tired of thinking about decisions? Well not anymore! Introducing the Brain in a Jar! Never think about anything again. Let the brain do the thinking for you! Simply kill anything that the opponent tries to put out, gain life for doing that, and then when you get bored use a Seasons Past and let the fun begin again!
The meanest deck around. Kill all the things, gain all the life, repeat.
Removal
Ruinous Path - Kills anything in the format except Ohrmendal
Blighted Fen - Gets rid of some of the things
Languish - Gets rid of all the things
Remorseless Punishment - Sacrifices must be made to the gods of slaughter
Grasp of Darkness - Kills most of the creatures in this format
Ob Nixilis Reignited - Kills a thing
Ulamog, the Ceaseless Hunger - Blow up 2 things
Lifegain
Nissa's Renewal - Ramp it up and get some life in the process
Prism Ring - Nothing feels sweeter than a deck that gains life for killing things
Pulse of Murasa - Snag back a Blighted Fen to kill something, gain life for it
Card advantage
Ob Nixilis Reignited - Draw a card, lose a life
Read the Bones - Set up your next couple cards, draw them, maybe lose a life or two
Brain in a Jar - This sets up draws, can cast instant speed removal, and it's a brain in a jar... 'nuff said.
Seasons Past - After removing all the things, get your removal back so you can do it all again
Dark Petition - Find something and then use it
Duress - See their hand, get rid of something, all for one mana
Win conditions
Remorseless Punishment - No matter what they choose you come out ahead here
Ob Nixilis Reignited - Because Ob
Seasons Past - Alright, this is more of a won't-lose condition than a win condition, but it gets you back a win condition
Ulamog, the Ceaseless Hunger - Because Ulamog, that's why
Kozilek, the Great Distortion - Kozilek fills the hand up, discard to counter then get em all back with Seasons Past
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Sideboard
Duress - To hate on control decks, the goggles decks, etc
Transgress the Mind - See above
Orbs of Warding - Stop those pesky burn decks, and that rogue mill deck
Seasons Past - Bring this in when you think they have counterspells or hand removal
Root Out - Clean up something nasty like a Pyromancer's Goggles, get a clue... seems legit
Virulent Plague - Shut down all those pesky Secure the Wastes and other shenanigans
Languish - Bring in against creature-heavy decks
Grasp of Darkness - See above
Remorseless Punishment - Bring in against midrange and control decks
Pulse of Murasa - When you need that extra lifegain