It shouldn't be interrupting your jutsu at all. If it is, you're not timing correctly. Hold off on casting Gaara's jutsu till Scarlet Blaze acts or at least until just before the jutsu would activate (after all prompt jutsus have fired).

Waiting to activate a jutsu until the right moment will have it fire off instantly with no warning to the opponent and no chance to interrupt it.

That's a mystery jutsu and it's only 3 times. Another passive can add an attack to make it 4 times. If they kill someone/clones they get extra attacks each time.

Versus say a Wind main using her mystery jutsu to deal massive damage to 9 targets all at once. More total damage.

The Sleep attack passive is a standard attack though. None of Lightning's standards attack multiple times, though a passive can give them 2 standards per turn. Only 2 unless they kill clones/ninjas. Zabuza and Suigetsu have the same ability so you can get that passive for your ninjas as well just as the sleep attack is something Itachi can do.
This post was last edited by Kyutaru at 2016-8-11 11:03