This deck gets mad scary. I make it so each and every card I play becomes a threat to the opponent that they MUST respond to (or die trying!). It is not uncommon to be attacking for over 40 damage on turn 5 (although you can attack for well over 100 damage on turn 5 if you draw the right cards). A typical win for this deck happens anywhere between turn 4 and turn 7. On average it is turn 6. If you have even one forest in hand, you should try playing it. You will almost always still come out on top.
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MAINBOARD
Corpsejack Menace + any card in the deck = epic badassery
Nylea, God of the Hunt for trample, and that extra boost if I need it. Also works well as an indestructible blocker. Also, who doesn't want to be able to scavenge (6) +1/+1 counters for 4 CMC?
Jarad, Golgari Lich Lord This bad boy helps make my creatures wondrously disposable.
Reverent Hunter
There is plenty of green devotion, so let's pick up on the action.
Mana Bloom Why yes, I like having somewhere to dump my extra unused mana into. Even better with
Oath of the Ancient Wood
because it keeps me up with tons of +1/+1 counters
Oath of the Ancient Wood
With this many enchantments, it's nice to get some perks off of them.
Bow of Nylea
Deathtouch? Yes please.
Kalonian Hydra Need I even mention why?
Renegade Krasis Incredibly useful card for this playstyle. It evolves quite often, and with a Corpsejack Menace out, all of my creatures suddenly become even bigger threats.
Varolz, the Scar-Striped He makes for a great blocker, and his ability provides the crazy aggro that this deck loves and spews.
Experiment One gives me control over control decks. With the counterspam in here, it lets me keep persistent blockers/attackers.
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SIDEBOARD
Golgari Charm allows me to boardwipe white weenies, regen from a Supreme Verdict, or get my stuff out of a detention shpere, for example.
Gaze of Granite Good ol' fashioned boardwiping.
Abrupt Decay Really useful. Many permanents are 3 or less CMC.
Putrefy to kill those pesky opponent-controlled creatures that somehow survived my onslaught
Vraska the Unseen for that pesky planeswalker that always seems to show up.