[@Raijinslayer]
Ohhh, I like him, and I think that [i]you[/i] might like [url=http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=420795]this[/url] friendly fellow, a mardu. And not just any one, one that'll make most creatures suffer. Combined with [url=http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=378460]Archetype of Aggression[/url]... Lethal damage = 1, any damage more than said 1 will be dealt to the creature's controller, which makes blocking a pain.
Other than that I'd suggest taking a look at the guild's cards, specifically the charms (so [url=http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=420835]Rakdos charm[/url] in your case) seem to be doing well.
And other than THAT, I'd suggest looking up the mardu cards, since that's the tricolor clan that uses red black and white. 

As for the mechanics, I believe they were mentioned before; Hellbent and unleash. Though madness would also be a good fit.

I hope that helps you figure things out a little. By the way, the [url=http://gatherer.wizards.com/Pages/Default.aspx]gatherer[/url] is any mage's best friend.