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.

Its not new to say this is one of the best cards ever printed, its not even really original to say this is a cornerstone of survivors to this day, both are things I feel strongly about but today I want to say something else great about lucky.

Its one of the first and best examples of a card that wins you the game by doing nothing at all besides changing your approach while its in your hand.

I have many times run lucky and held it back in my hand for rounds, sometimes half an entire game, never committing very highly on tests, sitting at a gentle 60% pass rate and never actually failing to a point where it would matter, the sheer amount of energy you save, the resources, the cards and the mental strain to just play super reckless and worry about the consequences later, you will win so much faster playing that way if your luck is at least marginal.

I can't count the amount of games I've ended with a lucky in my hand staring at me, gathering dust and looking back at how demolished the level was.

Its gotten to the point where lucky is SO good at making me win, I don't even include it in decks any more, it is perhaps to me is the only card in the entire game that simply by having had it in a previous deck (and no longer running it) I still get a massive benefit from it, simply by allowing myself to experience that risky, devil's gambit play style.

Lucky, it used to make me win games by sitting in my hand doing nothing, now it sits in my collection, and still is making me win games.

I'm curious what other cards can say the same for other players.

I've been running this as house rule alternative text on The Bell Tolls for awhile now and been having a ton of fun:

• Revelation: Put The Bell Tolls into play in your threat area. At the end of your turn: Discard The Bell Tolls. You are defeated. Suffer 1 mental and 1 physical trauma.
• Log, under your investigator's earned story assets / weaknesses: "But somehow, you've defied your fate..."
• Remove The Bell Tolls from your deck and search the collection for Overzealous and place it on the bottom of your deck.

The two main changes:

• Gives you one last turn, instead of outright death. Have had a ton of fun with this in multiplayer as the person who draws it gets to plan our their final blaze of 3 action glory!
• Does not outright kill, but simply replaces itself with another weakness. I chose Overzealous because it's generally regarded as pretty annoying. But, narratively, I always adore the idea of a doomed investigator surviving their fate against all odds... and get a bit cocky after ;)

In defense of the original:

• I will say, that playing it in the above way has actually made me somewhat love this weakness and appreciate the original as printed text.
• Recently, with the right / more experienced play group, we sometimes do opt to go with the text as is and simply plan ahead for the player who drew it to ready up a 2nd investigator. Oddly enough, the act of planning out that 2nd deck, sometimes makes them eager to die and switch! :P

TL;DR: they're your cards, have fun!