Gatecrash

Boros Elite | Creature | Human Soldier | Battalion — Whenever Boros Elite and at least two other creatures attack, Boros Elite gets +2/+2 until end of turn. | Willian Murai

Dutiful Thrull | Creature | Thrull | {B}: Regenerate Dutiful Thrull. | Daarken

Cloudfin Raptor | Creature | Bird Mutant | Flying Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) | Peter Mohrbacher

Realmwright | Creature | Vedalken Wizard | As Realmwright enters the battlefield, choose a basic land type. Lands you control are the chosen type in addition to their other types. | Slawomir Maniak

Shadow Alley Denizen | Creature | Vampire Rogue | Whenever another black creature enters the battlefield under your control, target creature gains intimidate until end of turn. (It can't be blocked except by artifact creatures and/or creatures that share a color with it.) | Cynthia Sheppard

Thrull Parasite | Creature | Thrull | Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.) {T}, Pay 2 life: Remove a counter from target nonland permanent. | Clint Cearley

Foundry Street Denizen | Creature | Goblin Warrior | Whenever another red creature enters the battlefield under your control, Foundry Street Denizen gets +1/+0 until end of turn. | Raoul Vitale

Legion Loyalist | Creature | Goblin Soldier | Haste Battalion — Whenever Legion Loyalist and at least two other creatures attack, creatures you control gain first strike and trample until end of turn and can't be blocked by creature tokens this turn. | Eric Deschamps

Experiment One | Creature | Human Ooze | Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) Remove two +1/+1 counters from Experiment One: Regenerate Experiment One. | Chase Stone

Spire Tracer | Creature | Elf Scout | Spire Tracer can't be blocked except by creatures with flying or reach. | Christopher Moeller

Wasteland Viper | Creature | Snake | Deathtouch Bloodrush — {G}, Discard Wasteland Viper: Target attacking creature gets +1/+2 and gains deathtouch until end of turn. | Lucas Graciano