Big stompy fish!
A lot of Leviathans have really bad "enters the battlefield" abilities (sacrifice lands, give away your permanents, etc.), so I need to run Stifle effects, plus other cards that try to get around these (Time Stop, Illusionary Mask, etc.)
Since I was already there doing the theme, and there's not quite enough Leviathans, I added in some other huge creatures with very bad ETB abilities as well. (This part of the deck is slowly going away withj time.)
I switched this deck from B/U/G to U/G/R when Xyris was printed. This means I can't run one of the Leviathans (Nemesis of Reason), but that's OK, I'd rather have a Legendary Leviathan as the general.
Marjhan was a Serpent in Homelands, a Leviathan in Masters Edition II, and is now a Serpent again on Gatherer. So leaving it out for now.
Click here for a text version of this decklist
Click here for my EDH Commander decks