With the Swift Justice deck, your plan is to come roaring out of the gates, keep your opponent off balance, and end the game as quickly as possible.
Many of your creatures cost two mana or less. Elite Vanguard and Stromkirk Noble are both fantastic turn-one plays, and Bloodcrazed Neonate and Ashmouth Hound are follow-ups that are primed to attack. As long as some damage will get through to your opponent, it's usually correct to keep attacking, even if you'd lose one or two creatures in combat.
Since most creatures in this deck are small, you'd like to prevent your opponent from blocking them. Niblis of the Urn and Niblis of the Mist can tap your opponent's creatures so they're safely out of the way, while Nightbird's Clutches and Markov Warlord can each prevent two creatures from blocking for a turn. Anything to keep on the pressure!