You get boots and health pots for mobility and sustainability in lane.
You can get boots of mobility for faster movement speed to catch up but, since you have your w, which i call chicken, you can just slow them down. You then get infinity edge for damage and 250% crit damage. After that phantom dancers for attack speed and bloodthirsters for life steal. At the end you build another phantom dancer for more attack speed and another bloodthirster for MORE life steal. At the end of the build, you should kill champions in 4 seconds. OP right? Your crit rate will be 95% always and all you need is some fury. Since you have undying rage, you can live for like 4 seconds and since you are so op, you kill everyone in a short time, so who needs guardian angel? What's the point of that? If you die, they just swarm around you and when you get back up, they punch out your front teeth.

Teleport so you can teleport to a ward and gank them or save a dying turret. Flash to get away