Early Game : You NEED MID LANE with this build, then just Last hit Lasthit Last hit
because your useless in early/mid game without the first 2 items

Mid Game : after Finishing your first Tiamat try to go for ganks just Ult em and let your team do the rest

End Game : Just stay behind and try to hit enemys with Q when they low just R cause your R deals like 1300 dmg (-much Armor like 500). Your not supposed to deal much dmg with auto attacks it does deal dmg but the main dmg is from your skills when you follow up my build. GL & HF

Pros - It just pwns if enemys dont go for much hp/armor your ult does them like almost 1 hit (not joking)
You can easy push/farm lane cause you need 4hits for a whole minion wave
Also usefull in a 1v1 if you hit your Q and R he surely gonna be dead if hes not that tanky

Cons - You almost got 0 Durability so you can die in 5seconds if you get focused

Just Stay behind your Tanks your Pocking game is really awesome just always fire in some Qs and theyll lose Hp over hp

Always try to camp in bush with a trap in it wait for him to Walk in then just Q and E him so you can auto hit him a bit and then finish with ult.

With this guide Red Buff isn't Really needed just ask your teammates to let you the blue buff cause you need the cd's and the Mana to spam your Q out and have the Reduced cooldown on your Ult this is really helpful.