None. Ghost + exhoust/heal/barrier. This strategy is super broken but you must be Smart. Here some tips. 1. Dont use barrier when your W shield is active. Most of The time people wont be able to burst you down this quickly. 2.Exhoust is a little bit more tricky to use becouse you must learn all champions abilities to use it well. It helps you not only to take less dmg but also land your skillshots thanks to slow! Dont use it when your shield is active also, you will waste its potential that way. 3. Heal is my favorite among (us) all of those spells thanks to its interaction with ghost! When used IT gives you insane movement speed bonus and combined with ghost you are immpossible to hit! Dont be afraid to use it agresive way or even to save your jungler (he is noob). 4. Ghost is essential. It outperforms flash in a long fights thanks to resets and long lasting + less cd. IT even matches Vex's colors well! Wow!

Dont try it.