Here I just wanna show you guys how I play with Evelyn. So here I show item what I build and how I play.

My masteries are typical 9/0/21. I put bretty much every one who got AP these masteries.

I take on runes:
Greater Mark of Magic Penetration for magic penetration, Greater Seal of Replenishment for mana regen, Greater Glyph of Scaling Ability Power for some ability power and Greater Quintessence of Movement Speed for more movement speed, so i can run fast, i have good magic penetration, pretty good mana regen and some ability power to the starts.

Items i try to get as fast as possible Lich Bane and Mobility Boots. After Lich BaneI wanna get Void Staff for great Magic Penetration. In the last item I put Frosen mallet becose when you fight, you wanna make as much damage as possible all over enemies! You can chose some defensive item instead of Frosen mallet if u want to, but i prefer Frosen mallet

When you walk trought the map with Shadow Walk and you notice an opponent, you want to put Agony's Embrace on and then hit him with Ravage. After you hit him with Ravage and he's stunned you start to spam your Hate Spike until your opponent dies. Use your Ghost if it's needed.

In teamfights you just wanna stun ppl and spam Hate Spike and Ravagefor max damage.