Sorry for the late reply.

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I concentrate my Suiton chakra and use a random wide scale Suiton jutsu which spreads a large quantity of water everywhere and I spread my Suiton chakra through the water so a shark forms using condensed Suiton chakra and shape manipulation. The shark then attacks your clone and slowly pulls it under the water which then follows up with a cascade of sharks coming and biting you leaving nothing of your clone once they have finished.
Advantage: Once the jutsu is set in motion, it’s a lethal technique
Disadvantage: I assume the user needs to keep their hand on the water source whilst this technique occurs.
I slash the body of water before me which launches my opponent high up into the air. On doing this, I create five sizable sharks composed entirely of water which attack my clone until one of them successfully swallows him whole before imploding, launching my clone into the air once again. The remaining four sharks surround my mid-air clone and force him underwater before imploding all at once, dealing severe damage to my clone.*
Advantage: This technique is awesome and I prefer techniques which cram many things into one
Disadvantage: Can be interrupted during the jutsu