I made a Rescue deck of only 2*s with the following cards, I doubt it could beat any decent deck frequently, but it could get enough points that it could lose a few times without much trouble.
Are you willing to use unevolved cards? I use Fang Pi Clang low star half decks in DT's frequently and they're very effective. I've won several DT's using deleted. You could use a 1* Unagi instead of Yusuke and Filomena instead of Lyse Teria Cr in a 17 star deck.
If you want only 2* cards, RG365's deck is as good as it gets. You could use a 2* Elvira instead of a 2* Lobo, but th eother 7 cards are no-brainers.
I think that all 2 star cards is a bit extreme
maybe try a combination of two and three stars for a deck around 20 stars. I would suggested clans with +/- bonuses as you will probably be out powered more often than nought. You have no idea how easy it is to sneak Mickey T in for a win because your opponent doesn't adjust to the 18 attack difference.
Gina Glitt 2*
Well, dunno if it would work, but it's not horrible. Other half decks could be Ulu Watu (Jeff, Warren, Gabrielle and Bree) or All Stars (Mario, Flo, Ashley and Frank) or Nightmare (Sheitane, Hel, Eadh and K Cube)