15 Cards in hand is very unlikely unless I've missed something that gets you a huge hand size boost and even then you're unlikely to both fill the hand and want to hold them all.

10 is doable with the new size boosters (Looking at Harvey Walters) but a card in hand is one you aren't using

Quite a few Seekers routinely hold 5 cards for their Educational edification however. It's not fast or free but if you're playing with a big hand anyway you might want this over the Magnifying glass (it's a Tome)

EDIT: I missed Dream Enhancing Serum which could get you some very big hands -you're probably still better off just throwing the cards at checks most of the time.

Game designer Matt Newman has confirmed on Twitter that The Watcher’s Grasp effect includes causes the Spectral Watcher to exhaust: “Q: Does the Spectral Watcher exhaust after moving and attacking with Watcher's Grasp? If that's the case, it would not attack later in the enemy phase, right? A: Yep!”

from mobile.twitter.com

A much, much cheaper alternative to Sign Magick. Not only does it cost one less resource, you also don't have to spend the resources and action playing the spell you just made room for. And because of its reaction ability and the fact that it doesn't provoke AoO, it's effectively fast if you only play it when you need its effect. This is a card that has so much convenience going on that, if this were a competitive game, it would be considered broken. We'll see how it plays out in practice, but it's very appealing for decks that can take it.

Who benefits most? Mystics like Akachi and Agnes, at 5 will, can use it to replace events that allowed them to fight or evade when their spell slots were full. Mystics whose will is closer to their other stats see less of a benefit, but still might like that third-slot versatility. For non-Mystics, who has the will to make it work? Parallel front Daisy with original back can pump her will to awesome proportions, but that fills her hand slots. Carolyn might actually be the non-Mystic who gets the most from it, as she has decent will and generally free hand slots. It allows her to evade cultists and pick off rats which she normally can't do herself, so it's pretty useful for her too.

Very compact card, performing a lot of functions. Interested to see this in action.

Guardian economy in an uncontested slot? Because let's be real: nine out of ten times the investigator who needs the most help offering for their assets will be the guardian. In a Sister Mary deck this feels like an auto-include, since it only needs two tokens sealed to beat Emergency Cache, with the potential to far outstrip that in terms of resources generated. It remains to be seen if someone like Roland or Yorick will be provided enough tools to stuff the chaos bag with bless tokens and make this reliable.

It also remains to be seen if someone like Carolyn or... Skids, I guess? could make use of it as a support tool for the other members of the team. I can't really think of anyone else who could take it (besides Dunwich, and it's probably too niche unless they're going full bless) and not really need the economy; Diana can take it but she wants her arcane slots, and there isn't a seeker/guardian that I know of, or a minor guardian other than those above. Correct me if I'm wrong.

So the power here depends on whether I can load the bag with bless tokens while fighting, moving, and protecting my allies; if I can (or if I'm Mary) it's arguably better than emergency cache. If I can't, it's probably a miss.

Final note, it can't go under SttP, but that's a pretty minor hit. Excited to see it in action.

This seems to be a contentious card, but in my opinion the worst part about the card is that it simply isn't fun or interesting. Many of the card milling mechanics in Dunwich don't have significant counterplay and it's easy to draw this at 10 cards left in your deck and just eat shit. Every other strong encounter card has something you can do to mitigate its effects, like passing a skill check. This is just really boring and doesn't make me excited to play Arkham Horror.