Spending any scrolls on tendo is a huge waste, all of those ninja will be near useless to you by the time you'd have the scrolls saved up to pull for a chance at tendo. A handful of the pains might still have use, but that's a big might.
Tendo still has a place in areas like GNW or Ranked, but it sounds like you intend to use him as part of a main team, which is not recommended at all. Kaizer recently put out a video where he did this and since 2.0 the results are really unfavorable. There is also the aspect that you might pull hashirama instead of tendo.
Save those scrolls. With 400 scrolls you could get your pick of han or roshi and definitely get sage naruto (if you want to invest in sage, which I wouldn't). Alternatively you could go deep in kage treasure, all of which are solid ninja that should last awhile. Dumping those on a tendo chance is one of the worst things you could do with those seals.
Aside from pumping them into the upcoming reanimation treasure that is. ;P This post was last edited by Kaigen at 2017-3-10 14:48