[Autumn]

In this game I don't think its ever healthy for LoS to be blocked, White Prison isn't used nearly enough to have been a problem regarding that, and I'm sure people would grow just as annoyed if it were spammed without end. Jam is correct in that Smokescreen's hit penalty is massively effective, smokescreen can very often force an opponent to move and trade equal momentum spent, or less when answered with 1m mobility or a move that would damage and move you at the same time. (Flip shot for example)

Smokescreen is not good for these reasons, its numbers are high but its application is not so useful sometimes, I would be more inclined to go with Kunai's idea where Smokescreen could be a circle, but as a result it should become less of a hit debuff. (Still something significant like -25 Hit) As then the usefulness of the ability would be to trap you and your opponent inside, or an enemy and an ally inside, the Ninjutsu talent "Kagero" should also assist in this endeavor, and should be considered among these kinds of builds.

Additionally I believe that the Ninjutsu talent "Endan" should apply to all smokescreen tiles instead of just bomb smokescreen. (Maybe at half effectiveness.)