As a multi-target mage, Khamet is a great example of what people should want. With his basic attack dealing solid damage against 2 targets and a 400% increase when making the first hit that he gets back every 7 attacks, he is enough to knock down any group in game. When you add his attacks bouncing when they kill, and the high damage multiplier on his ultimate if you need a mage he should be the first place you look.