consider tragedy to go with windstorm of etaqua
also consider:
3rd DM
DM Girl
Painful Choice
Old Vincidtive Magician or 2 (apprentice magician can set these)
Double Coston (DM and DM of Chaos)
I think some of these can add a little speed to your deck. they are all cards i like to use in my DM deck. I am thinking of changing mine into a Dark Paladin deck, though, so my whole strategy might be changing. I've noticed that there are a ton of DM decks popping up on realms lately and it takes away my sense of individuality.