User blog comment:Gifist8/Lazarus Pit Return---Season 5 Arrow/@comment-24425431-20160829024732

Given the fact that Merlyn was reluctant to use Lazarus Pit on Thea, I don't believe he would use it on Tommy, even if it were possible. And I don't believe Oliver would use it on Tommy either, after what it did to Thea. Nor would Thea, given her own experience. And those are the only 3 people (still alive) with possible motivation to get Tommy back.

If there was a functional Pit and it was used, it would probably be some psycho using it on Damien Darhk.