Here's a top-down design I just thought up for someone trying to absorb as much information as possible until it overwhelms them, unfortunately I think it came out feeling a little too blue and not black enough
Hunger for Power BBB
You have no maximum hand size.
At the beginning of your upkeep draw a card.
At the beginning of your end step if you have 13 or more cards in hand you lose the game.
Depending on how budget you would like to keep the deck, cards like Life from the Loam, Crucible of Worlds, and Tolaria West are staples in Legacy Lands. Here is a legacy decklist if you want to see some card choices.
2bb
Rare
Creature - Demon
Flying
At the beginning of each combat, any opponent may sacrifice a creature. If a player does, tap Desecration Demon and put a +1/+1 counter on it.
Transmetropolitan
Your design plays interestingly with Promise of Power
http://www.wizards.com/magic/magazine/article.aspx?x=mtg/daily/deck/1002
Desecration Demon
2bb
Rare
Creature - Demon
Flying
At the beginning of each combat, any opponent may sacrifice a creature. If a player does, tap Desecration Demon and put a +1/+1 counter on it.
6/6