Rule note: you have to move 1 doom from defeated Sliver Twilight enemy, if any.

"When": The word "when" refers to the moment immediately after the specified timing point or triggering condition initiates, but before its impact upon the game state resolves. Thus, you need to move doom before you resolve defeat, so that the enemy is in play at that time.

Question: Imagine I have 5 event cards attached to Crystallizer of Dreams. I play an event that has good skill icons. Can I remove a card from Crystallizer to make room for the new event I played to take it's place, without committing it ? Or can cards only be removed from Crystallizer if they are committed to a skill test? An example of not wanting to commit a card on Crystallizer could be that there are no relevant icons (ex: it's a fight test, and none of the cards on Crystallizer have a fist icon).

Another card I love to hate. It's delicious in design; you can get rid of it, if you are willing to take the slight sting of an Attack of Opportunity on a move. It's got a high enough combat that you will probably need to spend cards, ammo, charges, or some other resource to get rid of it. It's such a little thing, but it demands that you decide what you will give up. I suppose if you are playing Obfuscation or Survival Knife (2, you'll be OK, but it's still an annoying little beast.

When playing Sister Mary in a high player count I often got annoyed when somebody else would pull several blesses at a time on a simple test that they would've succeeded on anyway. This prevents that once a round (note that it can activate at ANY location unlike the other covenants!), and being Mary, I also need those blesses to seal, kill, or delete, and if most of them are gone after the mythos phase and you have no bless recharge in hand, it can be infuriating. This 2 xp card might not look powerful but that's only until you see it silently doing work. If your cards consume blesses, you will love this, but if all you want out of blesses is to just make the bag easier, Sacred Covenant would probably be a waste.

Edit: I completely forgot the "unrevealed" condition. That really ruined the intent I wrote here for this card. It just becomes incredibly niche and I don't think it can get out of Shortcut's shadow.