With an early Bloodthrister you get alot of Poking of on the other adc. If you have a hard time by getting Focused in Teamfigts you can build a Guardian Angel. But if you need more Crit Chance you can skip the second Bloodthrister and get Infinite edge. And if they have alot of CC you can get a Mercurial Scimtar as your last item. The early Zeal and Vampiric Scepter gives you alot of Power to Burst down the other teams Ad Carry. When you get your Bf Sword Draven is just a pain for the other teams Adc. The Warmogs is important for late game to get that extra Boost of Health in the Teamfights. The Lastwhisper is a very good item for Draven it helps you Burst down the enemy Tanks with your huge amazing Critical Hits. Lets get back to the second Bloodthrister shall we. The second Bloodthrister is only important if you find it easy in Teamfights. If the Teamfight is hard as i said before pick up a Guradian Angel. And agian if they have alot of CC pick up the amazing Mercurial Scimtar for slapping away those Stuns. Let us get to the Boots Enchantment, i pick up Furor cause the extra Movement Speed stacks so well with your W Ability Blood Rush. If we take togheter the Speed Bonus of Blood Rush and Furor we get a total of 72% extra Movement Speed when you toss a Basic Atk and activate W.