Edit (5/8/13)
Added: Riders of Gavony, Tajic Blade of the Legion, Teysa Envoy of Ghosts, Sin Collector, Tithe Drinker, Spike Jester, Riot Piker, Armored Wolf Rider
Removed: Jor Kaden the Prevailer, Truefire Paladin, Teysa Orzhov Scion, Cartel Aristocrat, Butcher of Malakir, Goblin Deathraiders, Goblin Electromancer, Selesnya Sagittars


300 Expansion (3/10/13)
Added: Cavern of Souls, Armageddon, Mana Tithe, True Conviction, Dawn Charm, Harsh Mercy, Madcap Skills, Rapid Hybridization, Aetherize, Daze, Forbid, Force Spike, Miscalculation, Dismiss, Power Sink, Negate, Essence Scatter, Hands of Binding, Turnabout, Elvish Archers, Edric Spymaster of Trest, Golgari Decoy, Spikeshot Elder, Legion Loyalist, Foundry Street Denizen, Goblin Guide, Skinbrand Goblin, Lobber Crew, Bane Alley Broker, Fathom Mage, Syndic of Tithes, Basilica Guards, Truefire Paladin, Ulvenwald Tracker, Lightning Mauler, Nearheath Pilgrim, Precinct Captain, Student of Warfare, Cartel Aristocrat, Zealous Conscripts, Guul Draz Assassin, Drana Kalastria Bloodchief, Duskmantle Prowler, Duskmantle Seer, Rakish Heir
Removed: Shimmering Grotto, Elvish Branchbender, Blightsoil Druid, Lllanowar Dead, Michiko Konda, Masako the Humorless, Goblin Outlander, Gut Shot, Mental Misstep, Forbidden Alchemy, Solemn Simulacrum, Brass Herald, Riptide Replicator, Tumble Magnet, Ratchet Bomb

Edit (11/6/12)
Added: Radha Heir to Keld, Coralhelm Commander, Safehold Elite, Nagao Bound by Honor, Hand of Honor, Hand of Cruelty, Ritual of the Machine, Sorin's Vengeance, Chaos Warp, Shimmering Grotto
Removed: Lys Alana Scarblade, Gaea's Skyfolk, Galina's Knight, Lyev Skyknight, Steward of Valeron, Juniper Order Ranger, Murder, Mark of the Vampire, Desperate Ravings, Nephalia Drownyard

Edit (10/31/12)
Added: Vampire Nocturnus, Bloodghast, Goblin Matron, Solemn Simulacrum, Shrine of Burning Rage, Ancestral Vision, Snuff Out
Removed: Driver of the Dead, Duskmantle Prowler, Skirk Prospector, Wirewood Symbiote, Skywatcher Adept, Think Twice, Victim of Night


Breakdown

300 cards

Creatures:
20 Merfolk
30 Vampires
30 Goblins
35 Elves
50 Humans

Non-Creature Spells:
30 Blue
20 Black
20 Red
15 Green
20 White

Other:
10 Artifacts/Artifact Creatures
20 Non-basic lands