Grixis
A Limited deck, by Brian Demars
4th place at a tournament in Indianapolis, Indiana, United States on 2012-12-23

Maindeck:

Artifacts
1 Rakdos Keyrune

Creatures
1 Bloodfray Giant
1 Daggerdrome Imp
1 Desecration Demon
1 Frostburn Weird
1 Grim Roustabout
1 Isperia's Skywatch
1 Lobber Crew
1 Pack Rat
1 Rakdos Ragemutt
1 Runewing
2 Sewer Shambler
1 Voidwielder

Instants
2 Annihilating Fire
2 Auger Spree
1 Inspiration
1 Thoughtflare

Sorceries
1 Inaction Injunction
1 Rakdos's Return

Basic Lands
4 Island
6 Mountain
5 Swamp

Lands
1 Izzet Guildgate
1 Rakdos Guildgate
1 Transguild Promenade