Hearthpwn

This deck is total ASS.  1-5 at Rank 19.  Junk deck - don't waste your time.

is Mojomaster Zihi really needed? it's the only card i need in this deck. Can someone tell me a replacement if it's not that important?

It's not needed but it does really well against several classes, like before a hunter can play Zuljin or a Rogue turns stealth, amongst other things. 

Ive been using mojomaster after gouldan . It makes it hard for them to get board control and easy for you to go face by using ur hero  power  lifeseal to build your health up. I'm rank 8 so far( not legend) ...yet

Have everything but Gul'dan what do I do :O

Try another deck. Gul'dan is essential! :/

What purpose does Mojomaster Zihi serve in the deck?

maybe its there to fuck with combo decks in the late game

That was one of the reasons I suspected aswell. I see a greater advantage doing so in more aggressive decks like tempo rogue though because they have a lower curve in general.

As an Evenlock I tend to need every mana crystal I get. Oftentimes my hand even gets too big to play The Lich King without burning cards. That's my perception at least but maybe I'm wrong

Yep. And since even lock is a midrange deck we can still play most of our stuff