Location: Some city like wher J-man gets laid.
Terms: Itachi cant use Susano'o and only is alowed 1xTsukiyomi and 1xAmaterasu. Diedra cant blow him self up and he starts in the are with his C2 dragon.
Distance:50 Meters
Bloodlust:All
So fight.
At that distance Deidara will have no difficulty taking flight and attacking with his C2 dragon. Hidan might want to try "using his immortality as an advantage", but if he can be blown to pieces by exploding tags it might be a bad idea in this case. To synergise with Deidara using the C2 dragon, Sasori will probably want to use the Third Kazekage for
satetsu (no point in using
hyakki no sōen if Deidara is making big explosions). Deidara and Sasori probably know that they're going to have trouble here.
C2 dragon explosions and
satetsu together make it hard for Itachi to use
amaterasu and distance makes it hard for him to use
tsukuyomi. Kakuzu can fight back with elemental jutsu, but probably won't be gaining any advantages there. (C2 dragon explosions are immense and
satetsu shigure right through the middle of one is nasty.)
I think Deidara and Sasori make a strong combination here as they can do a lot of damage with long-range, unfocused attacks. Chances are that with
satetsu crashing into the ground and C2 explosions, the air will become very dusty, and a clever Deidara will seize the chance to use C4 Garuda ? himself flying high enough to evade it, Sasori not caring about it, and Hidan running away or whatever.
By rights, Itachi and Kakuzu should win. Kakuzu can't be defeated by Sasori, and can only be beaten by one of Deidara's moves. Itachi should be able to see Garuda with clear sight and should be able to trounce any of the opposing team. But I don't think it'd necessarily work out. Could be wrong though.