I don't like to see Shika using elements ... Unless he develop one by his own - He is a Genius and he may do it -
"Shadow Army No Jutsu"
Shikamaru has to preserve a lot of Chakra , Use all the Shadows in the Battlefield and Gather them .... An Army of 10 or more Soldiers "Shinobi" _ Such as Chiyo Puppets but neater _ comes out from these Shadows ... they move and attack the opponent under Shika's well ... they can also use Kage mane and other Kage Jutsus .... He can use them as a decoy or as a shield to protect him ...The only problem that he can't use it with small shadows , It won't be enough to make 10 .. maybe from 2 to 5 ....
I add to this ... If Shika has Enough Chakra .. He can transform those Shadow Shinobi Into Shinobi He fought Before Including the One In Front of Him .... They can Use their Jutsus and Attacks - I know it is almost Impossible - But Shika Deserves My Love ..