DESCRIPTION
I used to play this with an Avatar of Might and a Polar Kraken instead of the Autochthon Wurm's. The Polar Kraken's upkeep just became to difficult to deal with so I side boarded them and threw in another Avatar of Might.
Also, I just recently added the 2nd Avatar of Woe at the expense of a Diabolic Tutor. If you are not playing against a lot of big creature decks I recommend putting the tutor back in.
One final note, I play with an Underground Sea and an Underground River. Obviously two Sea's would play better but I cannot justify the price tag. After play testing the deck I think it works just fine without the added expense.