It looks pretty decent, except I think the curve is relatively high for only 20 lands. If it were me, I'd cut a few cards in that 3 CC slot and add a few more lands. Maybe a couple of hauntings and a couple of giests; or that singleton dissipate?
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not sure if you're aware of this or not, but I thought I'd mention that you can't actually pay kicker costs on things you bounce with Venser. You might want to use something other than Marshal's Anthem and Lightkeeper. Granted, you CAN use the kicker if you return it to hand with Kor Skyfisher, so they aren't terrible in this deck as it is...just might not be quite as good as you were hoping.
It actually looks pretty decent to me, though I'm not sure you need eight fireball effects. Granted it is a 9 point fireball by turn 5 so their should be some in there, but eight seems like too many. I hadn't thought about the dragon lord, but you are right. He would be really good here. If you're just looking for extra stuff to do with all the access mana Koth can generate, I was concidering building a red deck around Koth+Kozilek. Turn 5 Kozilek can be brutal and not just because of the Eldrazi...in a deck this packed with burn, the 4 cards refuel your hand regardless of what happens to the creature. But I've never been one for the straight RDW answer. I'd say do some play testing with it and see what happens. It looks pretty close to the idea I was going to go with. I'd run 4X Fireball, 1 Comet Storm, 2 Kozilek, and one other mountain. 22 lands seems light if you want to make sure you hit your forth land drop on time. If you don't like the Kozilek idea, I'd say go ahead and run a couple of dragon lords in his place.
That actually looks pretty good. I don't think you need the Elvish Pipers though, since most of the cards in the deck have a relatively low casting cost. The only exception to that is the Gelatinous Genesis, which you can't cheat into play with an Elvish Piper anyhow. 21 lands is still a pretty low amount, but you have enough mana producers that it may not be an issue. Still, with creatures being susceptible to removal you may run into some problems only running 21 lands. You'll have to play it and see how it runs. Additionally, because you are running so few lands, Oracle of Mul Daya is rarely going to be an advantage for you. You could probably replace it with something else; additional Omnaths, Hydras or Warcallers would all be good possibilities for replacing the Oracle and the Pipers. If it were me, I'd probably opt for the Omnaths. Garruk, could go up to 3 or 4 copies as well. Orin-Reif the Vast Wood could be handy here, and man-lands are always nifty. Dread Statuary might be decent. Also, you do need to cut out 2 cards...run 60. It makes a difference!