It's hard to appreciate On the Brink with the current card pool, but if you are playing with everything you have this cards gets ludicrously good very fast. It completely outclasses upgraded Unexpected Courage. Having this in hand means you can take bigger risks, and commit more cards in hand to a test you want to pass without worrying about wasting all those card if you draw the wrong token.

This helps you a lot with skills that care about succeeding to trigger, like Do or Die and Resourceful, and especially with skills that want you to succeed by 2 at least, like Brute Force, Sharp Vision and Expeditious Retreat, while also offering autofail protection, letting you return the card and draw one to replace On the Brink.

It has less good synergy with Take Heart, given you usually want to commit this to test you know are gonna fail, and getting a +2 makes said failure less certain, outside of Drawing Thin, but the level 0 version introduced in Miguel's pack works a lot better for that on the basis it only gives just a +1 instead.

So if you are a Survivor that likes to commits lots of cards, like Silas Marsh and Isabelle Barnes, or someone with Survivor access like Minh Thi Phan there is no reason why you shouldn't run this. You won't regret it.

How to understand (Max once per game)? You can heal an investigator only until you fail, or you just cannot take more than one trauma per game once you fail the test? Or maybe you can heal any investigator max once per game and if you fail you get trauma?

Not much to say about this card, except I like how it is very close to the Heavy Rain treachery in Scarlet Keys, so we have consistent rain mechanics.

The reason I am writing this is a maybe helpful suggestion: I was going into the mines on day 2, and I didn't like the flavor of rain underground. In case this comes up for you and you feel the same, and you own The Forgotten Age (as you should), in the encounter set Forgotten Ruin, there are 3 copies of Deep Dark. I am switching these out for this scenario on Day 2. They are not identical, but they both target your clues in a way. Deep Dark seems weaker, but it's a good flavor fit I think. In 4 player, Deep Dark could be worse if it comes up at the wrong time.

So they do buffed .45 Automatic by reducing 1 resource, which is okay. But also with a new name, like why? I don't really see a problem if they just buff .45 Automatic instead.

I don't really appreciate card games eliminating old cards like this, although I can see .45 Automatic are not eliminated totally in Arkham, because you can take them both if you need four .45 Automatic. But still, this gun will replace .45 Automatic completely.

Fantastic ally on Leo Anderson, given it synergises well with his main ability

Main issue Leo has, is that eventually you run out of space for allies, which basically blanks your ability outside replacing allies with other allies, but with G-Men as long as you keep a free slot for them you can keep playing them using Leo reaction and enjoy a 2/2 tanking (or possibly more with The Star) and +1 to all your stats for a turn as long as you have one resource, which will get refunded during upkeep.

Just don't let them get defeated! I don't think the forced effect will trigger from the discard pile!