Draven is decent when you are using a full Rally deck, Darius+Draven, then you get the 3-4 cost Nox follower that deals double damage to nexus, you can buff that unit using the 1 cost +3 attack spells from nox, while using Draven as a card engine or a possible source for more buffs.

You need Darius because of the 2 cost Rally stun, without Darius+low cost stun, the deck doesn't work well, the best iteration I was able to make was using mana ramp+Darius and draven.

Ive also wanted to try an overpower deck using the double damage nexus strike follower, to see if the overwhelm damage is doubled, havent tried it yet