Kassadin sucks big time, i never get any kills with it, it got so low hp..
Kassadin is almost equal to Garen in OPNess WTF!
You on EU or US? I'll show you some Kassadin rape..
Getting used to kassadin:
>Start with dorans ring
>boots
>Skill order: QEWQQRQEQEEEWWWW
>Build mana crystal
>Crystal into catalyst
>Mejai if you're confident
>Tear if you got some mp5 runes or got the possibility to get blue buff
>Go for a zhonyas, start with the rod
>Catalyst into banshees veil
>Finish Zhonyas
When you're more experienced I'd suggest starting with a catalyst and then tear even before the boots, you could also skip the banshees. Another protip is to max E first if you got farming troubles.
Always bring flash or cleanse on kassadin, use your ultimate to ESCAPE or CHASE, not to deal damage. E is your main damage source, Q is for harassing and CC.
I'd explain alot more but I'm way to lazy. Anyhow, Kassadin = <3