So they gave us the effect of Cho'Gall as additional wasted spell card? WTF. To make use of this, we actually need SPELLS THAT ARE WORTHWHILE TO CAST. Holy fuck, how hard is it to give warlocks some playable spells? The last decent spell was Imp-losion and that already rotated out a year ago, and even that was sometimes terrible. Blast Crystal Potion is decent enough I guess, but a simple Dark Bomb-like thing would go a long way. Nope. Maybe in one of the next 5 expansions. And no, the new Imp-losion is just 1 mana too much.
Also, this is just terrible VALUE. You pay 2 mana + health + 2 cards to cast a single spell for X-2 mana cheaper. Yeah, right. How about no.
Example: With Siphon Soul, you pay 2 mana, 6 health AND a handcard to get it 4 mana cheaper. If Cho'Gall doesn't see play, this will probably neither. However, it might see some play in some very late control decks, akin to Handlock before Reno.
I'm just another one of those. You know, those who do things. Things that need to be done by those that do these things in order to do those things that don't do these things themselves. Has the word 'things' lost meaning to you already?