I've been having fun with Zyriel then Lord Agapanthus up the back when I expect a lot of melee sneak. He's already great there, and his Shield ability minimises the impact of any Returned fire, while Zyriel's life leech keeps her alive longer.
Usually its a life team, so I'll often put Warrior of Peace in front of her, to reduce all 3 incoming damage types.
You are the Master! I don't have Zyriel yet and my cards are at Silver League level so Warrior of Peace only weakens Melee but using him with Weapons Training is definitely on the cards. Warrior, Ave Sturgis, Lord A would make a good Life backline at my level when expecting Sneak. Thanks for the tips.