This is a deck I built just to try a different color, I wanted something fast and less complicated than other decks I've used in the past. Really made for fun, but potentially competitive.
Creatures
Monastery Swiftspear: the backbone of the deck. She's quick, and she can be buffed to crazy numbers thanks to prowess triggers.
Bloodfire Expert is the same deal as Monastery Swiftspear getting those prowess triggers to make them hit harder.
Arena Athlete & Frenzied Goblin: You can use whichever you have. They only both appear in this deck because I didn't have four of either. Both pretty decent, good for getting those blockers out of our path.
Generator Servant: Probably one of the less useful cards in the deck, but it let's me get some things out with haste that normally don't have it.
Archetype of Aggression: Probably my favorite card in the deck, because it render's chump blocking basically useless if they don't want to take lots of damage to the face.
Onto noncreature cards we have...
Titan's Strength: This card is so good, a +3/+1 instant cast buff with scry, add that in with prowess and you will hit hard.
Hammerhand: Another amazing card when combined with prowess, and it lets you avoid blockers when you cast it.
Dragon Mantle: Really in this deck just for card draw, since the low curve leaves you with less cards in your hand. The prowess/heroic trigger and activated ability are nice too.
Tormenting Voice: A draw card, but there isn't much draw in red.
Dictate of the Twin Gods: The endgame card, only play it if you can get away with a killing blow because the lack of lifegain will leave you wide open if your opponent can recover.
Planeswalkers
Chandra, Pyromaster: She helps avoid blockers, her exile ability is nice, and her ultimate can really make things go out of control, especially with Dictate of the Twin Gods on the board.
Sarkhan, the Dragonspeaker: One of the highest cost cards in the deck, really have no good reason for putting him in other than I pulled him from a booster. Would consider replacing with another Chandra, more testing needed.
Sideboard
It needs to be fleshed out more, but the only sure thing I feel I can put in there currently is Arc Lightning to replace Lightning Strike when going against token aggro.
Valley Dasher: A pretty bad card, but decent against some type of control when I need to use my spells more conservatively so they don't get countered.
Barrage of Boulders: Probably another decent card, because believe it or not it's not hard to hit the ferocious trigger, which is what we want out of it, for the killing blow.
Shatter: Decent against any artifact shenanigans.
Peak Eruption: If Chained to the Rocks is giving you trouble in a Mardu Deck, slap them silly.
Would really appreciate suggestions, especially with the sideboard since it's kind of bare bones as far as actual different cards. Thanks for reading!