The all time classic, Mono Red Aggro, Red Deck Wins. Small Red creatures paired with cheap burn spells. Most of your creatures have haste or the ability to gain it so you can deal as much damage as fast as possible. You forgo cards that just interact with them for more damage – you will end the game very quickly, win or lose.
The major thing to keep in mind with this deck is that you have many cards like Ahn-Crop Crasher that can entirely invalidate blockers to help your smaller creatures get in for the last points of damage. The curve and land count is intentionally low to assist in making sure the gas keeps flowing.