golgari-kinda-agro-thingy

You have a pretty solid start here, but the biggest issue is that you have mixed cards that don't support an aggro strategy.  For aggro you need to be ALL IN to either win or lose the game within the first 5-6 turns.  Typically, if someone is able to survive to turn 5-6 and can drop something sizable (normally Thragtusk or Supreme Verdict), aggro will lose.  Now that might not be the case if you're playing Golgari as you can access your fallen creatures in the yard and keep going.

So first off, I'd move the Deathrite Shamans to the SB then yank the Korozda Guildmages and Trestle Trolls.  Deathrite is great at controlling the graveyard, but doesn't really fit the strategy of what you're trying to do.  The guildmage might be able to pump and make something hard to block, but that's using mana that, to be honest, you will need elsewhere.  Lastly, Trestle Troll is a purely defensive card.  If you were stalling to try to get to the mid-range game, they would potentially be welcome, but as it stands, they're just taking up space.

So what goes in those vacated slots?  Why aggressive creatures of course!  You have a wealth of choices too ranging from Dryad Militant, Experiment One, or Rakdos Shred-Freak from RTR block; to Strangleroot Geist, Diregraf Ghoul, and a few others from Innistrad Block.  The key is to get as much power out of your creatures as possible given that they're going to be swinging most turns.

For your other stuff, you're sitting on some good ones but I have a few suggestions. 

1) Swap Giant Growth for Slaughterhorn.  He might cost two more to hard cast, but his bloodrush gives you the same thing as the growth, but his ability to be cast as a creature means he's not a dead draw on an empty board.

2) Drop Devour Flesh to the SB in favor of Putrefy.  Yes, it costs one more, but it doesn't give the opponent life, which is a BIG problem for you if you're playing aggro, as the last thing you need to be doing is making your own job harder.

3) Vraska typically underperforms outside of certain situations (believe me, I want her to be good too).  In addition to that, she's outside of your curve.  There's no real need to add more mana to consistently get up to five if she's the only five drop.  Move her to the SB and slide her in when you're facing more mid-range types of decks as she'll be able to produce at better value there.

4) Corpsejack Menace doesn't really do much for you here.  Sure, he's a pretty aggressively costed 4/4, but why not just run more Deadbridge Goliaths in that spot?  Or, as a personal suggestion, 2x Jarad, Golgari Lich Lord.  He's very often a HUGE threat, can sack your stuff so that you never even have to swing to kill them, AND can be brought back from the yard in the event he dies.  If the opponent is running board wipes, you'll have stuff in the 'yard, making him a bigger threat.

5) Rancor should be a 4x if you're going aggro here.  Outside of a completely empty board, it's never a bad card to play.

6) Dreg Mangler should also be a 4x for what it's worth.

Anyway, give those suggestions some thought.  I have a friend who pieced together something not too different and it's pretty dangerous when it works.  Just don't be afraid to mulligan aggressively, as hands with any more than three lands are likely going to flood you a bit.