A hard to evaluate weakness that leans more into the investigator's mechanics than her flavor. Looking at the two elements, the effect and the discard condition, we get:

The effect: You either break one of Lily's Disciplines, or you take a damage and a horror. Neither of these are terrible; it's usually more annoying than difficult to flip a Broken card (with the notable exception of Quiescence of Thought, and even there you might draw the ). Losing the bonus or a use of a Discipline's power might cost you tempo or a test, but it's not too likely to cost you a scenario. Similarly, with the card pool, Lily has access to soak and healing to handle a couple of hits. The problem is that. as you build up XP, you get more of these. One is pretty trivial, but drawing a couple in close succession might put Lily in jeopardy (although less so than Thrice-Damned Curiosity or Shell Shock. Additionally, they cause increasing dead draws, especially in scenarios that like to put extra weaknesses in the deck. In The Path to Carcosa, if Lily is lead investigator, she could easily end the campaign with a 37 card deck, 7 of which are weaknesses, and Lily doesn't have a lot of card draw in her classes, and usually has a moderately large rig to get out before she really shines.

The discard condition: Make your decision and then discard it; unfortunately, you probably have 1-2 more copies waiting for you.

All in all, this is a below average signature weakness, more likely to annoy you and slow you down than really capsize a campaign.

This is not the worst treachery in the game; it's often very mild, especially compared to things like Psychopomp's Song and Death Approaches, since you can often get it on an act or agenda ready to advance, but the artwork always makes me smile; it's funny and chilling.

If this card lasted until the end of that investigators turn, maybe it would see play in multiplayer if your friend is prepared to blast things with his shotgun (which also doesn't see much play), but sadly it is unplayable in this current form.

Harvey is basically unplayable... unless you take Versatile and Deny Existence. Then, he's probably the best seeker in the game. Once his signature asset is down hes a guaranteed 2 card draw per turn per successful investigate. Add a dream Enhancing Serum and he can basically hold (no joke) 20 cards in his hand at the same time. The 5 extra cards from versatile does slow him down a bit, but not enough to matter with the intrinsic seeker card draw.

Hes a shoe in for Farsight as well, and stack that on with an Occult Lexicon (or level 3, from the circle undone) and you basically have limitless card draw and can turn the ones you aren't using into resources.

But all of this is contingent upon taking that early game versatile and Deny Existence. Otherwise, he will get eaten alive by his weakness.

Compare this to sign magic. It's sadly not close.

Both will give you a free action. However...

Sign magic is worse in only one minor regard. You have to piggyback it on another spell activation. Alright. One point for Quickdraw holster.

Now. Sign magic is fast. Quickdraw is not. Sign magic is cheaper to play. Sign magic is cheaper xp. Sign magic allows a free action on all spells, not just attacks. You can use two sign magicks. Sign magic gives you an entire extra spell slot. Quickdraw only frees up a gun.

The balance isn't close.