What are the biggest double edged sword jutsus?

[slayerdanger]

What jutsus could injure or even kill the user? I was thinking Deidara's explosive clay could accidentally kill him easily. 8 gates is another one, what are some other ones?

 

[Draphsin]

RDS

C-0

Rinnei tensei

8 Gates

Any mangekyou power, susanoo especially [disregarding EMS & senju dna]

Bijuu mode without control of your jin

Hidan's ritual

That's all I can think of for now

 

[AlphaScythian]

Kamui, it just currupts so hard