Yeah, we've been using High Market in the main cube (also in the utility land draft) and it's a great extra sac outlet for the decks that load up on Threaten effects.
A card I think could be really good in this cube is warp world. I feel kind of ashamed as it strikes people as a casual card, but in this cube with the large number of tokens (which are obv permanents for counting in warp world) then you could easily break the symmetry. When you have the potential to put an eldrazi into play through this route it gets quite exciting too. Following on from this it might be fun to put chaos warp in as well when it has the potential to pop an eldrazi out the other side. I know you didn't want to be able to cheat the eldrazi into play but this feels more fair/fun.
Ps. How do you link to card images on this forum?
Alf
That looks awesome
The two play rather differently
This seemed to be fun:
Animar and rakdos give it a window to cast ulamog. Apart from that it's a 5-color Aggressive deck.
Most likely 0-3. Still fun to play.
http://cubetutor.com/draftdeck/6647