My idea might take alot of time and effort to make but how about this.
We create a type of generator that has already set effects. Each effect cost a certain large ammount of gold and gems to use plus requires a certain amount of DKs. Then in the generator it asks for the name of the Jutsu and has boxes next to all the set effects that can be chosen. Then you check the boxes of the effects you would like the certain jutsu to do. Also the effect can be edited after creation.
I.E.
Name: Rasengan
Effects (Please choose up to 5)
(X)10 - 15 Damage for 4 rounds (1,000 Gold, 1 gem) Reguires 5 Dragon Kills
( )20 - 30 Damage for 4 rounds (3,000 Gold, 3 Gems) Requires 10 Dragon Kills
( )30 - 50 Damage for 5 rounds (5,000 Gold, 5 gems) Requires 15 Dragon Kills
(X)2 Minions (5,000 Gold, 5 gems) Requires 10 Dragon Kills
( )3 Minions (10,000 Gold 10 gems) Requires 20 Dragon Kills
( )4 Minions (20,000 Gold 20 gems) Requires 35 Dragon Kills
( )5 Minion (40,000 Gold 40 gems) Requires 50 Dragon Kills
( )Self Regen for 15 for 4 rounds. (1,000 Gold, 1 gem) Requires 5 Dragon Kills
etc.
Of course alot more can be added and you wont be able to choose more than 1 of the damage effects or Minion effects per jutsu.