Template:Cho'gall strategy
While Cho'gall's Battlecry is powerful on paper, he's held back by the limited selection of synergistic Warlock spells. Their single-target removal is rather low-powered and their board clear will damage your side of the board as well. Not to mention it will put a dent to the Warlock's Health pool, which they need to conserve.
The most useful Warlock spells to use with Cho'gall are 
Shadowflame for a devastating board clear that doesn't hurt your own board, 
Dark Bargain, Siphon Soul, or 
Blastcrystal Potion for hard removal, or 
Kara Kazham! to build your own board.
With Mean Streets of Gadgetzan, Cho'gall has more opportunities to be useful. Getting a good Mage spell out of a Kabal Courier can be game changer and even the few potions from a Kabal Chemist can be situationally effective: for example, using Dragonfire Potion instead of Felfire Potion if you want to wipe the board but also conserve your Health. Kazakus Potions are also very powerful, and while the 10-Mana potions will bring you a third of the way to death, it doesn't matter if you can play 
Reno Jackson the next turn.
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