You really need some more creatures in this build.
You're running plenty of Teleports and a Cheetah Speed with which to make Hydras perform well.
A couple Gremlins is a good idea too. They don't particularly roll high, but they have probably the best survivability for a 7 cost creature, and a pair of them works well.
Do you have Conquest of Kumanjaro? Screeching Harpies and maybe Galador seem like a good call for any Air Wizard.
If you're going for a Damage over Time build, you really need to be playing Ghoul Rot and Magebane. I could see Malacoda being good here too, since you have ways to counteract the Slow.
A cool interaction is Idol of Pestilence, Whirling Spirits, and Malacoda/Poison Gas Cloud. The spirits aren't living, so they don't take damage, and you can probably push creatures back into the Gas Cloud or Malacoda.
I think that overall, you may want to focus your build on either DoT or Mana Denial, but perhaps not both.