Massive Boulder on Flight or Scythe?

I will put massive boulder on both of them because i managed to get another massive boulder skill. I already installed one on my Flight and it really manages to put me up in the ladder considering that most of the top 10 players in my server uses either Neon or Rhor as nukers after cygness casts rain prayer. It usually does OHKO this monsters though sometimes not.

I think i get both what I want then?