No Mercy (EDH / Commander)

This is what I like to call a "Kill Everyone" deck, where you don't care in the slightest what your own health total is - only how dead your opponents will be when you swing into their empty board with a 13/13 indestructible flyer.

STRATEGY:
Step 1: Make life hard for people. Play a mana rock (maybe) and continuously wipe the board with cards like Flamebreak. Maybe chuck out a Stormwild Capridor or Boros Reckoner to take advantage of the damage, too!

Step 2: Play Anya. Once Anya is on the board, devote all your resources to either making your creatures indestructible with enchantments or smashing an opponent's face until they're at less than half their starting life total.

Step 3: Play cards like Inferno, Manabarbs, Sulfuric Vortex, Fire Tempest, and all those lovely other cards under the "No Survivors" category. Contantly damage everyone (including yourself) and leave down just a couple indestructible blockers to deal with all the desperate attacks that are coming your way. Not that they can attack with much, what with all the constant board wipes.

Step 4: Pick off the opponents one by one. Swing in Anya equipped with something like Inquisitor's Flail to sink a heck of a lot of damage into them, winning the game.

NOTES: This is a pretty budget build, and as such I had to leave out some of the awesome cards (like Heartless Hidetsugu and Repercussion) that would often win the game for you. If you're building this deck, make sure to look through the Maybeboard to see if there are any cards that you are willing to spend a little more on.