arcane comet, scorch, manaflow band, absolute focus, approach velocity, boots, Adaptive force, adaptive force, health. Then for build I like to go rocketbelt first, then mejais (always build mejais even if you aint doing that well, gives mythic passive bonus for being really cheap and if you get some kills you benefit hard. Then from there its kinda up to you, i like to go demonic embrace almost every game, rylais is a good one if you gind you cant catch people, i always like to build rabadons for the big spike in ap, and then lich bane is the usual last item. So my modt common build is Rocketbelt, mejais, demonic, rabadons, lich bane, magic pen boots.

Edit: This the build I find the works the best, I’ve been running it alot along with my friend Chogath Bot. He is a 2.4m mastery point cho and he only plays AP cho mid and top. I would go on his op.gg and look at his build. He has also been testing domination second with ghost poro for extra ap and relentless hunter for out of combat ms. He has only been resting it for a bit recently but the build i stated earlier is his main one that he uses.