I had some success in low legend with this deck, but it was early in the meta. It can definitely win against paladins and mages sometimes. Also because deck takes it slow, watchposts aren't as strong against you, just Hysteria them (or even Soul Mirror if they are played late)

Mindrender Illucia is mostly for getting rid of opponent Pen Flinger

You should consider keeping anything cheaper than 4 mana because curve is so high. (other than Renew, against non aggressive classes is not all that good)

Also against classes you expect to go wide or do shenanigans (like druid) keep board clears