Hearthpwn

I'm playing an aggro paladin that had 57% winrate on metastats but I don't have Kotori Lightblade and my winrate sucks at 2 of 6. I'm really struggling with all Reno decks since they easily clean the board, restricts me to one minion and has enough healing to counter the damage I can do. I can't dish out enough damage in beginning to prevent them from recovering.

Strong? Yes. But essential? Not even close. You can make Pure Pally work without Kotori if you don't own him. Oftentimes the deck just plays him as a River Crocolisk. 

Considering that Kotori is rotating in 4 months, I recommend not crafting him unless you're hard pushing for ladder climbing or think you'll use him in Wild.