ill start with
(Suiton:Kokuun)-Water Style:Black Clouds
Type:Supplementary
Range:Short-Mid
Chakra cost:15
Damage Points:N/A
Descripton: Creates a down pour of oil rain from the sky that is flameable and can be used with fire jutsu or any source of flame to ignite the oil.
and combine that with
(Katon:Zukokku)-Fire Style:Intense Pain
Type:Attack
Range:Short-Mid
Chakra cost:30
Damage Points:60
Descripton: A huge burst of fire that turns into a huge fireball and can cover a large area buring allin its path.
and combine that with
(Fuuton:Renkuudan)-Wind Style Drilling Wind Bullet
Type:Attack
Range:Short-Long
Chakra Cost:30
Damage Points:60
Description:A huge spiraling sphere of wind that can do major damage to even a Summonig like Gamabunta.
your turn
I'll block the combo with 2...
(Suiton:Gufuu Suika)-Water Style:Typhoon Water Vortex
Type:Attack/Defence(can do both at the same time)
Range:Short-Mid
Chakra cost:30
Damage Points:60
Descripton: Wind Style Rasengan and Water Style Desctruction Torrent combo that makes a tornado of water that can be used to attack or defend and can drown out wind and fire combos(no water source needed to use this jutsu).
*btw, make sure the elements are legitamately combinable. Don't combine every single technique

That combination was fine though.

*
And I use...
(Suiton:Koukasuijin)-Water Style:Hard Water Spike
Type:Attack
Range:Short
Chakra cost:30
Damage Points:60
Descripton: user Hits opponent with a huge highly condensed spike of water that drills the opponent in to the ground(no water source is needed to use this jutsu).