For trading down a handful of times the Celtics will acquire by my count four future 2nd rounders in addition to Arkansas forward Jordan Walsh who they appear to be keeping. The Celtics originally selected Marcus Sasser at #25, but Brad Stevens is in his trading Marcuses phase, so traded that pick for #31 and two future 2nd rounders. Then he traded back again and then again.
Eventually he had picks #38 and #39 and kept #38 and traded #39 for a future 2nd.