I've been trying to build Slobad EDH but I don't think I could do a better job than this. I see alot of things I thought of at first and other things that I didn't that are awesome. The only thing I could suggest here is Furnace Dragon with the aforementioned Mycosynth Lattice, which allows you to erase the board and beat face for 6 every turn in the air.
edit: disregard that, I think that would remove the dragon itelf from the game.
I would recommend Granulate and Furnace Dragon actually.
couple it with the darksteel forge and granulate is a lowball wrath and an armageddon all in onesided fun.
The Dragon is a panic putton. when everything is going against you having him around just hits the reset button and gives you time to rebuild if you have the lattice in play when he drops..