This will help with the mid game These will help you start the mid game without feeling behind (Make sure you get Improved reach ASAP, as it gives your one a blast radius of a small nuclear device)
Get these to remove the enemy These are where your One gets to go thermonuclear (Odds you can purchase all of these is slim to none, but shoot for spirit items that enhance your one)
End Goal Green Extra Stam Goes a long way in the early game, as well as Spirit Armor for reducing self dmg. I will sometimes rush Bullet Armor if its a bullet heavy lane thats poking me down.
End Goal Purples Escalating into Mystic is when you really come online. Ideally you're hanging in the backline poking down with SSB and lobbing Malice into Bombs and blowing up teamfights. Boundless only ramps up that damage even further. Lastly, Sup Cooldown for even more artillery on 1.