Problem is with the Suiton buff, it fades right when your trick attack hits. So, between trick attack OR Hyoton, I would always go trick attack. The idea is not bad but not with Suiton which already has a synergise buff with something else.
Plus having 2 things heavily resting on one Jutsu is a bad idea I think.
I'd rather see the "stealing" aspect of Mug reworked for buffing Hyoton in this case (since, who uses it to farm mobs to have MAYBE 1 piece of shit you don't need taking an inventory slot anyway )