Basically it's a bunch of 1 and 2 card combos that end on Calamities. One tricky part of the deck is that Moulinglacia NEEDS to be summoned for the combo to work, but the nice thing about this combo is that it leaves plenty of space to play around in the extra deck. On the other hand, other combo decks have been hit pretty hard, and between Deep Sea Minstrel, Triple T, and Moulinglacia it can hand loop for 4 cards while setting up Calamities, which is pretty hard to out.
Deep Sea Diva is full combo, as is Abyssteus + Dragoons, Neptabyss + Moulinglacia, Neptabyss + Dragoons, Deep Sea Minstrel + Dragoons, and a slew of 3 card combos, especially involving Deep Sea Aria.