Creatures
Battlewise Hoplite, Fabled Hero, Phalanx Leader - The main Heroes of the deck, the +1/+1 counters can build real quick and make them extremely deadly.
Daxos of Meletis - Almost a Hero, unblockable by big creatures (I'm talking to you, silly green decks!), with slight decking and a chance to get some various extra spells is interesting.
Frontline Medic - A staple of Boros aggro, this card works well here as a a survival tool, and gets the added bonus of countering Rakdos's Return, Sphinx's Revelation, Curse of the Swine and so on.
Soldier of the Pantheon - Been a fan of this card ever since Theros was released, with protection from RTR and a source of lifegain makes is insanely useful.
Instant
Azorius Charm - One of the most versatile of the guild charms, particularly good for lifegain with the mass aggro, or spot removal against big blockers. Heck I could even target my own Phalanx Leader to trigger some +1/+1's on all my creatures.
Dauntless Onslaught - Great Heroic multi-trigger pump.
Swift Justice - Cheap Heroic trigger, first strike can be great form of removal.
Enchantments
Aqueous Form - Cheap Heroic trigger, unblockable and scry is a deadly combo.
Ethereal Armor - More cheap Heroic trigger (I think there might be a pattern here), with more first strike and a potentially big permanent pump.
Ordeal of Thassa - Great for keeping a card advantage or not losing to one, and making creatures bigger.
Spear of Heliod - This beauty just makes my whole board absolutely gorgeous, and can kill counter attackers. What's not to love?
Side Board
Brave the Elements - Best used against decks with lots of removal.
Celestial Flare - Great if I'm facing a deck that can easily block me out (Blood Baron of Vizkopa you're such a funny guy), or against other aggro decks.
Curse of the Swine - What's that? You don't like bacon? Well, more for me then I suppose.
Gainsay - Pesky control decks, why must you try so hard?
Glare of Heresy - Gee, it can remove lands, Walkers, creatures AND enchantments? Well shit son, that sounds like it might be underrated.