67-85 Magic Help

Best way?
I have around 13M cash to spend
Edit: Im not spending 13M.... a cheap way would be nice.
1 def, I dont feel like botting it.
I have members, but if i alched i would want to do it in f2p bh world.
Is splashing a good way?
I can afk that forever....how long would it take.
Overall: Tell me what to do, how much i will lose/make, how much time required, etc. Thanks.