If this card had no text other than “Myriad. Fast. Science,” it would be worth a pick for Kate. Up to three clues can be put on it for up for 0 play actions. As it is, it gives a lot of flexibility to people who want to draw through their deck quickly (which is most people in Seeker).

The cancel effect is great for Agatha, or anyone. Unlike defiance(0), you get to pick at the moment which you want, and it even replaces itself!

I can only assume the TDC campaign box has some kind of Geist enemies in it that can be damaged by this, but it's straight up bad in runs of Carcosa or Circle Undone, which have Geists that resist most types of damage. Maybe particularly bad in TCU, where the game practically expects you to cancel certain treacheries to balance the game.

I received this ruling through the official rules question form on Nov 13, 2024:

Question:

A recent ruling from this form about Plan of Action, posted on ArkhamDB, appears to contradict a previous ruling about Quick Learner. The new ruling states that Plan of Action gains icons during the mythos phase. However, Quick Learner which has similar wording was ruled the opposite and did not increase the difficulty of skill tests during the mythos phase. Has the previous ruling for Quick Learner been overturned?

Answer:

No; we are reverting the ruling on Plan of Action. In wanting to make Plan of Action stronger, we caused Quick Learner to become weaker since it’s worded similarly. We acknowledge that this was a bad call, making Quick Learner significantly less playable, and we apologize for it.

The current rulings are that Quick Learner only affects the difficulty of skill tests performed during your turn, not during the mythos phase; similarly, Plan of Action only gains icons if it’s committed during an investigator’s turn, and does not gain any additional icons during the mythos phase.

A bit too costly for what it does.

I would have liked a bit of adaptability, like :

Cost : 5 ressources.
Pay X resources to deal X damages to an ennmy at your location (half that damage, rounded down, it that ennemy is Elite).

You know, beeing able to pay the price in order to really be able to kill anoyone :)

You need a mandy I mean it. You WANT Mandy Thompson to search your deck and draw this weakness while you are holding a stupid revolver in hand so you can continue playing your Gatling Gun and Shotgun in peace. This weakness when planned carefully is not a massive investment cost but until that risk of losing all your investment is always there.