When i first saw this card, like many others, i thought that it was good but not as good as Hyperphysical Shotcaster which is a bit broken, but still strong. Now when i have seen it in action many times, i have to conclude that this card is just broken, and that FFG has again managed to push Seeker even more over the top. So this card has a wild symbol, is practiced, of course you are running Practice Makes Perfect because it is the strongest skill-based card in the game and just makes you double-up on Deduction and Perception, and now on important tests you do not even care about ? Wow! It takes Rogues 3xp to put Justify the Means in their decks, 6xp for 2 copies, and Mystics need 10xp for Seal of the Elder Sign which is basically this card + a bit of power depending on your . Survivors have some tricks like Eucatastrophe but these cards are kinda swingy when it comes to consistency and it takes some tricks to use their cards to their fullest potential, but Seekers do not have those obstacles and they just spam clues right off the start. Picking up your clue after this test if you draw an autofail is non-important, because you already have atleast 5 INT or even more, so it is just an action or sometimes you do not even pick it back up if it is not on a location with a victory. This card needs some serious tabboo right now and it needs to say that it can cancel anything except because this is just too strong for already the strongest class in the game, it is just absurd. Maybe players with a limited collection will not understand its power, but playing with a full collection, yeah, printing cards like this in literally every expansion just makes me wonder why the hell do Seekers get the most powerful stuff all the time? Are they not broken enough?

Relevant "prey" + "only" rule for reference :

If an enemy's prey instructions contain the word "only," that enemy only moves towards and engages that investigator (as if it were the only investigator in play), and ignores all other investigators while moving and engaging. Other investigators may use the engage action or card abilities to engage the enemy.

• Non-bearer cannot stand on its way to get the engagement. It is also costly to help because you need an engage action.
• If the bearer got eliminated/resigned from the campaign it simply stay still and everyone else can pass through.

This card is bad with Lola (its like they don't want her to be viable), but is extremely good with Charlie, especially late game. Charlie can very conceivably have a card from all classes up given his extremely diverse card pool (e.g., typical pick is guardian and survivor for his card class. In an enemy handling deck, you could then grab David Renaut, Delilah and a Med Student. You now have all five classes in play).

That translates into a +5 attack that does six damage, a serious boss killer card.

As others have said you're going to want to sit on this card a bit, especially Charlie, to get the full effect. But once you've got a rainbow assortment of allies on the table, fire at will and watch the cackling politican send his army of free lancers into the boss' maw.

In addition to @olahren review: William has a nice interaction with Mariner's Compass, Fingerprint Kit, Archaic Glyphs and other multi-clue cards. If you find yourself investigating a location with one clue, you can now grab that second one from somewhere else.

Charlie is a disabled old man with a cane and a bad smoking habit, until you play him off taboo.

Off taboo, he's a machete wielding lunatic who swarms his victims with a pro football player, dogs, a literal assassin and his trusty secretary. He uses Dig Deep and Drawing Thin to ace will/evasion checks, physical conditioning or combat training to buff his machete and loves explosives. He's even ever vigilant for eldritch horrors, and has no problem going Toe to Toe.

Don't count this guy out, unless you play taboo. I'm not sure how to play him without the ridiculous resource generation from Drawing Thin.

Tldr

Off taboo, starter deck should be In The Thick of it, Drawing Thin x2, Ever Vigilant x2, Jessica Hyde, Peter Sylvester, Physical Conditioning x2, Machete x2, Guard Dogs x2, Dynamitex2, Hallowed Mirror, Dig Deep then whatever you want.

This mitigates his biggest problem which is playing assets, and let's you do one (1) really good combat check per round. He's otherwise extremely tanky, but due to the fact he only gets one "good hit" hes dependent upon card effects that guarantee damage.

That's not enough to be a solo mob healer imo, and he will usually need to be paired with someone who can handle enemies just fine on their own (i.e. trish) but his strength comes from being able to do anything really, really well, one time per round.