So, about the new "Blood Moon" gamemode
Don't get me wrong; this looks like a really fun mode.
That said, do you really have to disable all but a few champions?
Couldn't you just adjust the non-assassins to play extremely aggressively?
You already removed all defensive items.
If you were to make defensive SPELLS (heals, shields, Taric ult) also less effective, we could see some fun things happening.
Full AD
vs Full AD 
you might see the occasional
but not nearly as often as the other 5.