Personally I like playing Rakdos very aggressively by using a fairly low curve, fast aggressive creatures and cheap burn/pump spells.
Aggressive Rakdos creatures I'd recommend: Rakdos Cackler
, Rakdos Shred-Freak
, Thrill-Kill Assassin
, Hellhole Flailer
, and Hellrider
A couple of my friend's also swear by Vampire Nighthawk
because of the abilities you get for the little mana you pay. Carnival Hellsteed
I found to be a useful finisher in the prerelease, although it's a fairly high cost if you're playing aggro.
Cheap pump spells like Deviant Glee
help push extra damage through. I found Dynacharge
really useful in the prerelease, due to overload.
Cheap burn also works really effectively to removal early threats and to allow your small creatures through. Pillar of Flame
and Annihilating Fire
have the bonus of being able to exile your opponents creatures if they die, which stops any graveyard interactions.
As long as you don't mind sacrifice your creatures Fling
is also worth a look especially with unleash and cheap pump spells.