System Down

Cydra x1
Giant Rat x3
Green Baboon x3
Momonga x3
Plague x1
Rescue Cat x1
Ryko x2
Sangan x1
Airbellum x3

Brain Control x1
Creature Swap x2
Foolish x2
Trunade x1
Heavy x1
MST x1
Wild Nature's Release x2

Beast Soul Swap x2
Bottomless x2
Call x1
Reckless Greed x3
Skill Drain x3
Solemn x1

My take on beastdown. Hasn't been tested yet. And this is WC09 so Baboon isn't fixed yet. xP

Well, Wild Nature's Release seems like a bad choice, since it's 1 card for just some extra attack. It can't even give you an OTK. I'd say switch them out for some Book of Moons or something. (Bottomless Trap Hole is Green Baboon's worst enemy and Book of Moon saves him from it.)

Other than that, it looks pretty good. I personally don't know about the Reckless Greeds, but that's just my opinion.

Nice deck.

Yeah, like I told you on msn, this was thrown together in like 5 mins. Now that I think about it, that combos I thought of with Release were kinda pointless. xP

-2 Release

+1 Grand Mole
+1 Exiled Force?

Yeah, those are good ideas. You might also wanna consider running another Exiled Force since they're so easy to search out.