This a mono-red deck that I made for after the next rotation in standard. Granted, once Theros comes out this will change a little but this is what Im working with for now.

Rakdos Cackler a 1 mana cost and I almost always bring him out unleashed making him a 2/2 that can be played off Turn 1

Legion Loyalist another 1 mana cost that isnt much on its own but because of its battalion effect it gives other creatures first strike and trample when it attacks with 2+ creatures

Burning-Tree Emissary a 2 mana cost at 2/2 makes it ok early on but is most valuable for its ability to add a R and G mana to your mana pool early on

Ash Zealot another 2 mana cost 2/2 but comes out with first strike and haste, also deals 3 damage to a player when they cast a spell out of the graveyard so watch out flashbacks

Firefist Striker a 2 mana cost with battalion where when it +2 more creatures attack a target creature cant block this turn

Chandra's Phoenix a 3 mana cost, 2/2, flying, haste, and comes back from the graveyard whenever you cast a red instant, sorcery, or red planeswalker deals damage to a player...yeah 'nuff said

Boros Reckoner a 3 mana cost, 3/3 that has a tap ability to give it first strike on top of the fact that when it is dealt damage it deals that much back to a creature or player

Chandra, Pyromaster 4 mana cost, +1 deals 1 damage to a player and 1 damage to a creature which makes it great with Chandra's Phoenix. The other abilities are great too

Shock pretty straight forward, 1 mana cost and deal 2 damage to a creature or player

Mizzium Mortars 2 mana cost, deals 4 damage to creature you dont control and has overload ability for an additional 6 mana