So you have a few ways to go here.

First off is the Young Pyromancer who will pumping out plenty of tokens from early burn spells.

Using that you have the teleport that won't be very difficult to overload and swing in along with the Nivix Cyclops who will be swinging for 4s.

The Mizzium Skin's are great for any spot removal and the Izzet Charm's for a board wipe/counter.

If you happen to get a Nivmagus Elemental early you can pump a few tokens into her for some early game damage.

The Guttersnipe to get the most for your mana.

You have Steam Augury and Opportunity for draw power which if you get a Goblin Electromancer is not too hard on mana to cast.

Later game if you need anymore damage output you have the Spellheart Chimera who should have plenty of fodder in the graveyard.

The sideboard allows for a bit more aggro control with the Cyclonic Rift's and Dissolve's.

If you feel you are pumping out plenty of tokens and they arn't doing anything to counter them you can bring in the Dragonshift's and Burn at the stake's for some extra fun.