Give Supreme Zombie, Skeleton, Spider, Cave spider, blaze, pig. (yes ik blaze is ult atm)
Give Ult All supremes spawners + Cow, sheep, rabbit. Yess. Rabbit.
Should be:
Elite - Spider, Cave Spider
Supreme - Elite's, Zombie, Skeleton, Sheep, Rabbit
Ultimate - All Above, Blaze, Enderman, Creeper, Cow, Pig, Squid
New $640 Rank - All Above, Slime, MagaCube, Ghast, Witch (hmmm, sounds like a new suggestion, im on it)
Edit: Im against spawners dropping "unlimited" items and really would hate to see the rest of the items associated with the suggested spawners here go down to worthlessness, but if we not going to remove all the other mob drops from spawaners then why the heck not just add all these too! I also figured it would be cool to make like Slime Arena, or Ghast Arena, but now that i think about it more Onis will probably just make them "dumb mobs" anyways and it won't work :(