Of the uncommon creatures not from the packs I will pick two:
Niblis of the Breath-DKA-U: Tap or untap target creature.
Relentless Skaabs-DKA-U: Undying.
Eight more creatures to go (I picked seven good ones):
Two of Deranged Assistant-ISD-C (one from the booster pack): Add 1 to mana pool.
Two of Stormbound Geist-DKA-C (one from the booster pack): Undying.
Scroll Thief-M13-C: Whenever Scroll Thief deals combat to a player, draw a card.
Archaeomancer-M13-C: When Archaeomancer enters the battlefield, return target instant or sorcery card from your graveyard to your hand.
Mist Raven-AVR-C: When Mist Raven enters the battlefield, return target creature to its owner's hand.
Now for the Sorceries, Instants and Enchantments (six goods ones, to get to twelve I would have to add some less useful cards from the packs):
Divination-Sorcery-M13-C: Draw two cards.
Talrand's Invocation-Sorcery-M13-C: Put two 2/2 tokens onto the battlefield.
Thought Scour-Instant-DKA-C: Draw a card.
Negate-Instant-M13-C: Counter target non-creature spell.
Essence Scatter-Instant-M13-C: Counter target creature spell.
Encrust-Enchantment Aura-M13-C: Enchant artifact or creature. Enchanted permanent doesn't untap during its controller's untap step and its activated abilities can't be activated.