Jund

Seeing as how this blog is all about discussing the "best decks", it seems remiss to not mention the "best deck in the format". Here's my version of the Jund deck that's rampaging everywhere:

// Lands
4 Savage Lands
2 Oran-Rief, the Vastwood
4 Rootbound Crag
3 Dragonskull Summit
4 Verdant Catacombs
2 Forest
3 Mountain
3 Swamp

// Creatures
4 Putrid Leech
4 Sprouting Thrinax
4 Bloodbraid Elf
2 Master of the Wild Hunt
2 Broodmate Dragon

// Spells
4 Lightning Bolt
3 Terminate
4 Blightning
3 Maelstrom Pulse
2 Garruk Wildspeaker
3 Bituminous Blast

// Sideboard
SB: 4 Goblin Ruinblaster
SB: 3 Great Sable Stag
SB: 3 Jund Charm
SB: 3 Duress
SB: 2 Thought Hemorrhage

You end up playing a deck made entirely out of the best cards in the format. Putrid Leeches can occasionally be a sucky cascade, but they still win against certain decks if you manage to drop them turn 2, and there aren't very many cards worth replacing Leech with.

The rest of the deck is fairly common. The Master of the Wild Hunt is tech from Worlds, but I didn't like playing it over Garruk because Garruk is also strong on its own and can seriously hurt control decks. Sure the entire deck is vulnerable to Lightning Bolt, but that's what the Oran Rief is supposedly for -- it may be slow, but it's also really powerful when online.