I feel this build would be more effective if you got Lich Bane directly after rabadon's.

Fair point but i dont think you need the extra slow that much and archangels is brilliant as it means you are never oom. I will try rylais again in my spair slot again though. Thanks for comment. I once went for over 1000 AP with stacked archangels and rabadons and soul stealer, so funny but not as useful as the normal build. lich bane is a god send.

You should try to use mp5 rune as yellow and use rylai instead of archangels , shrooms with rylai are so amazing .