Suppressor for annoying gun heroes like Haze/Gun - Mystic Vuln if suppressor is not needed, you can also skip some of those and go directly for Alchemical Fire
Most basic combo is - Ult -> Drop AF -> Beam to death Try to gank early with Boots+Ice Path Dont fuck up Teamfights with teribble ult placement DONT ULT REJU IF YOU DONT NEED TO IT WILL MOST LIKELY LEAD TO DISASTER Arcane Surge is OP but it doesnt fit everyone playstyle - or some ppl just simply miss dashjump window so its up to you to decide if you should go for it or play something else