It is important to note that placing doom on David is not mandatory and to maximise the profit from him it is best not to add doom every chance you get. A good rule of thumb is that you should choose to add doom a number of times equal to one-third of the remaining doom threshold on the current agenda when you play him (rounding to the nearest whole number) before using his ability with no doom until the witching hour. For example, if running David with Calling in Favors with a 6 doom agenda, you can maximise your resource gain in a single play of David by placing doom on him twice as follows:

-Turn 1: Place doom on David, gaining 1 resource. Mythos phase brings doom count to 2.

-Turn 2: Place doom on David, gaining 2 resources. Mythos phase brings doom count to 4

-Turn 3: Use David without placing doom, gaining 2 resources. Mythos phase brings doom count to 5.

-Turn 4: Witching hour so place doom on David, gaining 3 resources. Bring David back with Calling in Favors ready to replay for the next agenda.

This allows David to generate a total of 8 resources instead of the 6 you would gain if you placed doom on him on Turn 3. The effect is even more pronounced for agendas with higher doom thresholds, but the rule of thumb remains the same: place 1/3 of the remaining threshold at time of play.

This becomes a must pick for high draw seeker decks in Dunwich Legacy.

Slot pressure is usually only to dream enhancing serum, of which you only need one. Orphic Theory can essentially block everyone's favorite treachery, beyond the veil. This ends up being a very strong counter to that card, as you can proc Orphic Theory just before you meet the criteria for Beyond the Veil to trigger. It breathes life into high draw seeker decks, which used to have to spec into Versatile -> Deny Existence to run that campaign.

Outside of that, it has some pretty great uses still for most high draw seekers. A couple of treacheries that come to mind are Arctic Wind (an absolute bane to high draw seekers in EoTE) and the possessed treacheries in Carcosa.

Overall, definitely don't count it out. If you're in a campaign with "safe" treacheries Farsight still probably wins the slot, but at 1 exp it's a godsend for those bad ones.

The obvious benefits of Breach the Door, already stated:

• Makes it possible for even the lowest intellect punching investigators to pick up clues

• Enables the clue getters to suck up clues even faster

Not mentioned yet:

Breach the Door combines very well with cards that provide benefits for 0 shroud locations. Some examples:

• Fast action exhaust Lola Santiago and discover a clue for free!

• Apply the shroud 0 to your Sixth Sense and Sixth Sense (4) when you pull a special symbol

• No curse token cost to play Stirring Up Trouble

• Automatic activation of Shed a Light to pick up 3 clues in 1 action

Special case:

• Guardians have access to a bunch of cards that trigger the discovery of clues, but they don't have access to many investigation boosters. Breach the Door definitely comes in handy when your low intellect Guardian draws the Unspeakable Oath (Curiosity) weakness.

I have a feeling that this might be good in Finn, to get a +3 Willpower, which also could double as a +1 if you really need it. Haven't tried it out though. If you have a way to boost your Willpower or Strength value, it get's even better, but that's probably not that easy in a typical Finn deck.

This also pairs well with Charlie Kane.

Decklist: arkhamdb.com

You can use a bunch of cheap allies with a Rogue/Survivor build. Priest of Two Faths, Treasure Hunter to stack the bag with Bless.