Just checked bdolytics, buying for imp crates is 100% waste of time.

However, some (quite a few) are worth if you craft.

I have some spare time to craft but i know most (all of them?) are bottlenecked by something.

Are there some elixirs that i can spam craft and also use for the imp delivery?

i have 1800 mastery.

Elixer of Amity is easy for me, but that's because I have gardens for flowers, workers for sap, and I don't mind killing lizards to make beast blood.......

Alchemy is tough.  Simply put.