Meditation is good for protecting units that get hit.
Devour I tend to use for targets I use swear vengeance on.
Blistering Wisp are good for pressure. I also love to focus this deck with draw power. This allows you to get to your clockroaches faster and you have a better opportunity to sustain with slay/harsh rule. I have not tested out Blackhall Warleader. I am still in the test stages due to the fact of not owning all the cards. Sword of Unity/Stand together grand card to protect roaches from silence or burn in the early game. If you want Blistering wasp at 4 and move Blackhall warleader down to 2. I was also thinking about the 6 cost version of harsh rule / banish / vanquish for removal. I am undecided still for Auralian Merchant/Reliquary Raider for further testing. For a fact I believe the stonepowder Alchemist seems to be a keeper with Meditation. I am open to suggestions for cards and if I get around to getting more cards I will be doing more testing.