Androstosity

Drop the drake, the clasp, the mutagenic growth and the lash. Add two more Blighted agent. Add two four Thrummingbirds. Add four giant growths. That should be a good start for now.

Keep in mind this will end up being an extended deck at best, Casual in the least. Don't expect it to go to tournaments anytime soon. You're using quite a bit out of standard. But, that being that, screw tournaments and have fun, aye?

Not a problem. Happy to see someone actually considering my opinion rather than throwing it out. The amount of time you put into the browbeat suggestion allows me to see that you have, in fact, tested it out previously and found it unsatisfactory.

As for Crash and the Pyroblasts, I am trying to find a sideboard for a goblin legacy deck and managed to stumble across those two gems. Always glad to share them with those willing to listen. Thanks for being open minded!

The way I see it is that Huntmaster is a trap for those that are going to play werewolves. He's good in a deck where he flips constantly. But werewolves loves to flip once and stay that way. Immerwolf is exactly what he hates playing with. It lets him flip once, but not again. Why not replace him with the much cheaper mondronen shaman? That way they have to pay for everything they play and immerwolf keeps her from flipping back.

As far as a first drop, why would you not play both? In an aggro deck, you need a first turn creature. No ifs, ands, or buts about it.

Here's my werewolves attempt. See how you like it and maybe toy with some of the ideas I used in mine.
http://www.mtgvault.com/ViewDeck.aspx?DeckID=327283

Also, for sideboard, I'd give yourself some diversity and change two of the pyroblasts into red elemental blasts (just in case extraction get one version). And maybe look into crash? An artifact demolition spell that you can pay by sacrificing a mountain is hard to pass up.

I really feel that a play set of browbeats would be beneficial in any streamlined red burn deck. Usually they just move too darn fast for their own good and run out of steam. With browbeat coming in at about when the opponent is low on life and you are low on cards in hand, it offers quite the choice for the opponent.

Well, it's a cheap card; a couple cents at most. Perhaps someone from your play group or a friend would be willing to hand you a play set?

Goblin grenade is a nice way to finish off an opponent when your creatures run out of steam. Just a thought.

Why not use Lord of the Undead? He'll raise zombies back from the dead for you and give you a buff.

Might want a few more kill spells to make sure that tragic slip is going off for 13 instead of 1. I'd say add more Throats and side some doom blades in case your throats can't hit.

Look into putrid imp. It seems to be the way most reanimator decks work their hand discard to keep cards from being dead draws.

Have you thought of browbeat? Most streamlined burn decks seem to run out of steam before the opponent is quite dead. It offers a few more cards or some decent damage right about when you're running low on cards and your opponent on life.

You could splash white to use silence and orim's chant to keep them off of yourself for a while. You can also use the scepter to throw either of those on a stick and use it repeatedly until you pull out your combo. You need a bit more construction in order for us to see a bit more of where you are trying to go with this...

If you're not trying to run modern too hard, then I'd suggest some Seat of the Synod. It'll make another artifact for master of etherium to get a pump from and give you another artifact target to work with for free (Not to mention you can pay the cost of the ability with it. Twice the bang for your buck.).

Otherwise... I think an etched champion would be pretty nasty.

You might need something to do other than just fatties with Kaalia dropping them. Something small to keep the beats down in case you don't draw the right mixture of mana?

Any better? Chucked in as many indestructible effects as I could find.

Why no Mother of Runes? That's a finishing combo right there... Thalia might not be a bad idea for a bit of help as well...

Bayou. You're trying to think of bayou.

two ports and two wastelands or something. Land control isn't easy to get.

Sure. That'd be nasty. And rishadan port and wastelands.

*your, not youre. It's possessive, not you are.

Also, use gideon's lawkeeper over avacynian priest. He costs less and his ability is the same thing with less restrictions. 4 lawkeepers, 0 priests. Also, why not use mirran crusader? He's too good to pass up.....