If you are fighting against teams that you are sure that they would focus you to death like Zeratul/Nova or others , I would recommend to use Mana Addict As Level-1 Talent & At Level-16 Arcane Barrier , It can give u exactly that mili sec you needed to one shot him or deal's heavy dmg to him do not die without purpose and do not overextend since without Mana addict and Arcane Barrier you can easily die be warned! , I'm Currently Working on an instructional Video will be uploaded soon! :)

All you need to do is stay from distance avoide as much as possible incoming dmg , Ur poke's are D W and Q's if you are at good state on ur mana if not wait behinde till you have D and then W priority on heroe's ofc but if there aren't any heroe's in range and they play turtle next to the tower do it on minions since you play with Fel Infusion which heals you every time you click on D so you can trade an auto attack from the enemy in order to W him with ur D for free and puts some preasure to the enemy walls/minions/tower's and whoever he is close to ,wait for objectives to pop up and be with your team always , If you are engaging you will die since you are not a tank and squishy & has no escapes so let ur tank do his job and assist him with ur insanely high dmg output

Focus on the squishiest targets and D+W+W at level 16 with chain bomb you will expload their face and their team if they are close to minons they can say good bye to their life Q with D most likely when you fall back and you poke meanwhile use D+W+W only when the enemy team is stacked up! or next to minons/towers/walls if none of this happens do the simple D Q and try to catch enemy's with ur E which is easier because of the talent which makes it not only faster also farther so GL and enjoy ! (You will enjoy)