The Ulu Watu 2* are useless except the -8atk manip. You might have something if you build it around Nanook, Gaia, Gaia Noel?, and just a bunch of high powered cards, along with someone like Stanly to 2HKO with.
Ulu Watu will not get you far at all they are just horrible for anything apart from Survivor and Death Match. If you must use them which I would strongly recommend not to do than the best deck would be:
That's 28 stars, you could get top 150 with it if you have a lot of skill top 50 is possible for experts. Top 10 would be bordering on impossible and winning is completely out of the question unless you are one of the best players in the game. I would recommend All Stars, Uppers, and Bangers for DT. Bangers even have the same bonus as Ulu and All Stars kind of do as well, here is a strong deck you could win a DT with.
If you use that deck in Elo than swap Quinn for Marina and Garrik for Graff