Next up i think the most obvius: Death Knight.
For this one i didn't use the requirement keyword cause i think it's clear that you need the rune in your starting deck to use the effect.
If you don't know what Specialization are go back to my previous post.
Old concept that i decided to redesigned and share.
This is a Specialization (based on a wow concept) and i plan to make one for each class.
It's a spell (non generable) that let you choose an istant effect and get a new hero power if you can meet the requirement.
The first guy name is hunter of course
I've designed this card to support heavy combo warlock decks like rafam or with my custom card Shudderlock. I know that this would be op in wild with demon seed but i immagine you could ban a card like this for wild if you wer to add it to the game.
If it's not clear the card lets you survive with negative health, then you can heal to come back to positive health but if you don't, you die at the end of your turn.(can also play another one of this)
What do you think about this in a current or future standard meta?