Creatures:
Monastery Swiftspear: Great turn one card, and with the combat tricks in this deck, can hold its own against larger creatures.
Soulfire Grand Master: Works great with burn spells to keep your life total up against other aggro decks, notably mono-red goblins, and its last ability allows you to buyback a Treasure Cruise if you need more options.
Seeker of the Way
: A good two drop, and like Monastery Swiftspear, can use combat tricks to trade with a larger creature and gain you life.
Icefall Regent Locks down an opponent's creature, and is hard to remove with its second ability.
Mantis Rider: A staple for Jeskai decks. Although he does have the three color cost, hardly anyone has a turn three flier that can match him. Multiple copies can win you games.
Thunderbreak Regent: Allows me to have a decent mid-late game. He's big enough to be a threat, and has the ability to force your opponent to take 4 damage in the air per turn, or use a removal spell and take 3 damage as a side effect.
Spells:
Anticipate: Against a slower deck, playing this on turn two allows you to find the card you need. It also helps you find the color of mana you need to play effectively.
Spell Shrivel
: An upgraded Mana Leak. Most of the time, the extra mana turns this into a hard counter.
Wild Slash
: Basic burn spell.
Valorous Stance
: For those pesky Siege Rhinos and Tasigur, the Golden Fangs.
Jeskai Charm
: A very versatile card. Use the first option to temporarily remove a threat so you can connect with an attack, the second as a burn spell if the 4 damage will kill your opponent, or the last option as a combat trick for massive lifegain and effectively a +2/+2 for your prowess creatures.
Disdainful Stroke: With the slower format, this spell is more effective against a wider variety of decks.
Sideboard:
Reality Shift: For the threats you can't Roast.
Dispel: Great against control or burn decks.
Disdainful Stroke: Mainly sided in against Abzan matchups. Stops their Siege Rhino from hitting the board. Also useful against control decks.
Negate: For the control matchup. Stops their removal and counters.
Roast: Better than
Valorous Stance
against non-red "go wide" strategies, especially with the combo with Soulfire Grand Master.
Erase
: Enchantment and constellation hate.
Arashin Cleric
: White's way to deal with red aggro.
Silkwrap
: Deals with a lot of aggro deck creatures, and especially good against Jace, Vryn's Prodigy (Flip).
Fiery Impulse
: An easy 3 damage burn spell with the amount of cards that turn on spell mastery.
for my binder.