At league start, this build would cost at most 45 divs to make (almost 6M DPS). but the build is a solid league starter and only need to invest that much if you want to kill ubers. Most items you need craft them yourself :(

Build in the video https://pobb.in/cje45SyuTQKF

Cheaper build (30ish divs, 4.4mil dps) https://pobb.in/s7Y_GLV4QjpJ

Even cheaper build(20-25divs, 2.6mil dps - can do all content except for ubers comfortably and is quite tanky) https://pobb.in/shSRveoIcqoE