To be honest, I have just about no experience with Jund aggro. But I did playtest this a few times and it performed pretty well, so I have no complaints. My only suggestion is that you should consider Exava, Rakdos Blood Witch . +1

Slitherhead maybe?

I have tried it with Slitherhead but it slows this deck down a bit.

I love aggro Jund decks. Have you thought about Rubblebelt Maaka , Scorchwalker , or Slaughterhorn ? all of them are have cheap bloodrushes and cheap costs for Varolz. Also, Mogis's Marauder gives quick block-resistant hastes. All in all this is a great deck, keep up the good work!

at the moment i don't think i need any of those but if i put any of them in what would you suggest i take out for them?

Solid, I like this build. My only thought would be Exava, Rakdos Blood Witch as well, she only costs 4 mana and can make a few of those creatures, like the Rakdos Cackler + Corpsejack Menace come in very hot. I like the hasty side of things more then the scavenge, though I see why they both are in and they both work well, so I would say that Mogis's Marauder is definitely worth it in this deck as it can potentially make a few of your creatures unblockable. You could really just put him in the sideboard though, if they are running U/W it would be perfect. +1

But what would i take out for Exava, Rakdos Blood Witch ?

I'd probably take out Reaper of the Wilds for the Exava. An excellent card, but hexproof isn't that important, if you have plenty of targets for removal anyway. In that case, I would also look into putting more unleash-creatures into the deck.

Why isn't Hellhole Flailer ever getting any love?

How is your mana holding up? Seems a bit land light to me, with quite a few four-drops in the deck. I'd use at least 22, maybe 23, especially since you have quite steep color requirements.

I think Nylea, God of the Hunt is an easy choice to come out. Too few sources of devotion to get her online and if you want to rush your opponent, you'll never have enough mana to use her ability and trample shouldn't be a big deal.

The Reaper of the Wilds is there because of the scry/deathtouch. i haven't had any land problems so i don't think i will increase it. Nylea, God of the Hunt is there for the trample and it actually helps a tun. thanks for your recommendations.

How about Tymaret, the Murder King ? He can give you extra reach if your opponent stalls out the board. I also think Varolz, the Scar-Striped is good for similar reasons, turning early drops into late game threats while being resistant to removal (If you are thinking of adding him in, another good card that works well with him is Tormented Hero ) I'd ditch the Legion Loyalist because it's kind of underwhelming with only one power

This deck is meant to kill them in the first 4-5 turns and the Legion Loyalist helps out more then i expected in to with the trample first strike tokens can't block battalion affect. I feel like Tymaret, the Murder King would slow this deck down to much but i try out Varolz, the Scar-Striped he might work out because if the opponent kills off my stuff i can scavenge them to the living ones for cheep.

I have a question for you, if you have a little time, about the Temples; how much do they slow you down? Is the scrying worth having a land enter tapped? I run a Jund deck too, with a full set of them, but I'm curious how it affects an aggro deck. It seems like it might be a pain in the rear for a deck that needs to be fast. Or maybe the scry is really useful? Just curious. At any rate, it looks really good, +1 from me!

Scry is actually pretty good in aggro decks, since this allows you to get rid of lands you don't want to topdeck. also 3 temples are not a threat i think.

w00tthehuk182 is right the scry helps out a tun in this deck and they don't slow the deck down very much. i normally can play a different land first and can play 1 drops while that land enters tapped.