2x Arcane Spirit this week....this makes me very happy because as I type, I am looking at Abynissia with everything she needs but 4 arcane Spirit, and her whole kit is really more about her third trait...so I will be playing around with some Demons this week.
Abhorath is not really worth using or wasting stones on I would think.
Acolyte is useful for spirit hunting with some deck setups.
Death - if you have, you should trait. One of the few troops I don't have.
Dragonian Rogue - I find I am using him in CotD Blue and Purple days about twice a day. On blue day, I run him right bhind Krys in the 2nd spot and prioritize hitting purple whenever Krys does not have enchant on. Stealthy and Arcane make this a really nice kit.
Morthani's Will - One of my favorite troops in the game, brings real versatility to a team.
Plague - I love his third trait, while there is a little RNG there, games where I can consistently hit 4/5 gem matches and he is hitting their attack and magic, it's just evil fun.
Psion - Works best in the first spot, but has no armor or stoneskin or anything so can be a little vulnerable. I will finish his traits this week and probably try him with Abynissa in the back
Queen Mab - I guess I should finish traiting her this week, but I am not really a fan. Most of the time I find she is easy to take out on enemy teams.