I'm always rushing for Mystic Reverb and for this items in exact same order MR,SoP,SC - 1st ability SD - for ultimate ability Sell Mystic Burst for free slot
My main build for 660+ games on Yamato.
For sure everything depends on your own skill and gameplay.
This build based around Spirit Damage of 1st skill. Max it asap. Later in game 40min+ you will have enough fire-rate and could do a parallel build in to Weapon to do a final push.
Farm jungle with 1st skill and combine it with Cold Front to make farm fast.
Also learn what items exactly do and why are you buying it before you bought it, that will make your gameplay more easier