Here's a gist of Kate's usage of clues :

Get your 1st clue and put it on Flux Stabilizer to flip it active. This one won't get you the +2 yet, just the flip. Don't forget to put version of Aetheric Current you like into the deck.

Play some Science or Tool assets in different slots. (e.g. Flashlight/Magnifying Glass on Hand, Dr. Charles West III on Ally, Chemistry Set on Accessory, or even First Aid on no slot?) Each one let you get +2 on demand when putting a clue on them. It means she can get 4 or 4 from time to time too, or even more if you place 2+ clues on different assets at once.

Try to make the asset clue-less again, so you can do more +2 :

• Spend clues as a part of scenario progress, and choose the clues on assets rather than on the investigator card. So turns out, if scenario allows multiple investigators to contribute the clues to advance, Kate want to spend exactly clues on her assets and not clues on her investigator card, so she is ready to do +2 for whatever coming up. You can do that more if other players can flex to get some clues.
• Find the jackpot Aetheric Current in the deck and an unlucky enemy to unleash the current on. This makes all assets clue-less, provided that you have 1 clue to flip back Flux Stabilizer.
• Get to make one asset available.
• Failing Failed Experiment and choose the clue drop option. You can drop clues placed on your assets, and use some left over clues on investigator card for the +2. (Not necessarily for picking the clues back up.)
• Other creative plays, like picking Magnifying Glass (1) up and immediately play it back to make use of your leftover clues. (If dropping the clue that was on it is not a problem.)

If you put a clue on limited use assets like Flashlight, beware if you spent all the supplies then you want to switch to other Hand asset wanting to replacing it, the clue on the empty Flashlight would drop. Same for clue on Chemistry Set then it get discarded due to its own effect.

On testing Failed Experiment, placing a clue to get +2 would be effectively just +1 because test difficulty also increases. For this reason it might help to pack other boosting solution into the deck like Inquiring Mind, Esoteric Method, etc. Or simply heal the horror back with Steady-Handed, Logical Reasoning, etc.

If you succeeded the test by exactly 2 before triggering , you cannot get healed since it requires you to adjust the value up or down by 1 before checking the heal criteria. If you are using the card for horror healing purpose, you need to succeed by either exactly 1 or exactly 3.

I think the "limit" effect on this card should be interpreted as "max" instead. According to the limit and max section of the rule book: Each instance of an ability with such a limit may be initiated X times during the designated period. If a card leaves play and re-enters play during the same period, the card is considered to be bringing a new instance of the ability to the game.

How does this interact with cards it’s attached to or has attached to it?

If I have it attached to Dr Horowitz or attach the Raven Quill to it and swap it back and forth, would the raven quill stay on? Would it still stay attached to Dr Horowitz? What if I had both. Would the Blade of Yoth simply slide in over the raven’s quill and beneath Dr Horowitz? To that end, would the Raven Quill need to name both “The Eyes of Valusia” and “The Blade of Yoth” or does it only need to have “The Eyes of Valusia” named?

Rules Question.

I’ve I’m playing, say, Ursula Downs and I run this and “The Eyes of Valusia” and I name both “Eyes of Valusia” and “The Blade of Yoth,” will the Raven Quill stay attached when I “Swap” them?