If you can have one jutsu

[HENI]

Edo tensei easily

Edo Tensei would be broken lol

 

[Rovalez monstra]

Buddha wood. It's appearance is epic.

 

[AnthonyMax]

i pick the Camouflage Jutsu or FTG . pretty useful in real life .
steal shit without getting caught , kill someone without getting caught , become world most famous assassin can kill even US president without anyone notice . pretty useful tool to get rich and get power

 

[Askeladd]

FTG or shadowclones.

 

[Red Slayer]

Body transfer jutsu