My partner and I just beat Carcosa for the first time yesterday. In Dim Carcosa, my partner's Akachi picked up the first 4 clues and a pair of fanatics spawned to pick up 2 more. I (as Minh) got to pick up the other 15 clues with this and deduction and wipe the entire board in one go.
I didn't draw my keycards for quite some time so it was in fact already act 3 with Hastur Lord of Carcosa on the board before we got anything going, so I can't quite recommend this as like. Optimized playing. But it is the most satisfying single action I have ever taken in this game.
Especially cause the two locations that didn't start on their damage version got got by me playing deciphered reality and deduction again on my second cycle through the deck. Truly a beautiful, beautiful scenario to take this into.
Edit: still think this is a good scenario to take this into but this is my reminder to myself that if I am not reading the FAQs on a card before playing it, I should not subsequently post about the experience before reading said FAQ.