Outside of heroes with the giant trait like Wasp, i read this card as 3 ER: deal 3 dmg to the villain or 6 dmg to a minion. As long as you keep your hp high enough (generally 7+), this is an efficient big minion killer card.

This seems terrible. The first time you use it, you are even on cards and down whatever disadvantage the encounter brings. The second time, you are up 2 cards and down whatever disadvantage the two encounters brought - which could very easily be a trade you don't want to make.

I can see this being considered in a protection archangel deck (especially if that deck is packing symbiote suit). This essentially becomes trading 1 resource to cancel the acceleration icon on archangel.

Bread and butter for protection. One of many 1cost (2ER) defense events which are good. What's more Nerves of Steel generates a energy resource so it's a synergy and extra simple to remove threat. For solo this is rarely too much to remove 2 from main scheme (but even one is positive opeation for this cost).

Rating (A-C) A- not maximum grade, because without removing threat this is too small efect

In 2 handed games, it’s hard for me to imagine many justice decks I wouldn’t include this in unless it was strictly a Basic Thwart based hero. 6 threat in chunks of 2 (and 3 or 4 threat in 3 chunks if you’re using Operative Skill, Passion for Justice etc) , that clears a crisis and then can hit the main in the same event, using wilds from X Jet or Quincarrier to essentially guarantee the maximum output, this virtually always clears at least one and often multiple schemes. This is my GOAT 2 handed thwart event right now.