Dark Horse:: While you have no resources in your resource pool, you get +1 [Willpower], +1 [Intellect], +1 [Combat], and +1 [Agility].

Lucky!:: Fast. Play when you would fail a skill test.
Get +2 to your skill value for that test.

Would these work together? That is, if I spend my last credit on 'Lucky!' do I effectively get a +3 if I have 'Dark Horse' in play, or is it too late for 'Dark Horse' to contribute its skill bonus?

You do get the benefit from Dark Horse. It flips on as soon as you spend the resource to initiate Lucky.

Every time something alters a skill test, the entire skill test is recalculated. So when you play Lucky you have to recalculate everything, and that would include your skills which are now at +1.

Not that there are many situations where it matters. At worst you're failing by 2, so with Lucky you're succeeding with breaking even. Dark Horse's additional +1 just becomes a win-more, unless you're trying to break Cursed Luck; or are failing by 1 and want to get to +2 for all those Rogue interactions.

8 hours ago, Network57 said:

Not that there are many situations where it matters. At worst you're failing by 2, so with Lucky you're succeeding with breaking even.

Lucky doesn't have a limit on how much you're failing by to play it (thinking of Look What I Found?), you can play it for the +2 even if you're down by 3, in which case the extra kick from Dark Horse would make the difference.

Still a narrow window where it matters, but could be the difference in that important test.

2 hours ago, Buhallin said:

Lucky doesn't have a limit on how much you're failing by to play it (thinking of Look What I Found?), you can play it for the +2 even if you're down by 3, in which case the extra kick from Dark Horse would make the difference.

Still a narrow window where it matters, but could be the difference in that important test.

I was thinking of LWIF, thanks

On 5/18/2017 at 3:13 PM, FireBones said:

Every time something alters a skill test, the entire skill test is recalculated. So when you play Lucky you have to recalculate everything, and that would include your skills which are now at +1.

This seems a little imprecise.

Does playing Lucky! at ST.6 (when you would fail) send you go back all the way to ST.1? If it did, and if you played Lucky!(2), which lets you draw a card, you could commit that card for its icons at ST.2.

Or is it just that playing Lucky! at ST.6 lets you redo ST.5 (Determine investigator’s modified skill value)? If it did, then the constant ability on Dark Horse would indeed apply.

Lucky!'s "when you would" ability at ST.6 directs you add 2 to the value you computed at ST.5. But even though Lucky!'s "when you would fail" takes priority over some "when you fail" ability, I am not sure how to read to rules to get you to go back to ST.5 (when card abilities modify a skill value) or to allow you to apply Dark Horse at ST.6 (when modifying abilities normally apply at ST.5).

From Modifiers: "The game state constantly checks and (if necessary) updates the count of any variable value or quantity that is being modified. Any time a new modifier is applied (or removed), the entire quantity is recalculated from the start, considering the unmodified base value and all active modifiers."

Therefore, since the bonus from Lucky! is modifying the investigator's skill value, the entire value is recalculated. This will include the modifier applied by Dark Horse if you now have zero resources, since from Constant Abilities "Constant abilities are always interacting with the game state as long as the card is in play. (Some constant abilities continuously seek a specific condition, denoted by words such as "during" or "while." The effects of such abilities are active any time the specified condition is met.) Constant abilities have no point of initiation."

Exactly when this occurs could be debated, but the final effect is definitely +3 to the skill test. Lucky!'s wording of "when you would fail a skill test" clearly indicates that you haven't failed yet (otherwise the card wouldn't work) and Dark Horse begins interacting with play the exact moment that you have zero resources (which, formally, is before you resolve the text on Lucky!).

I'd say that it simply occurs in ST.6, during "Compare the investigator's modified skill value to the difficulty of the skill test." The rules text of Modifiers then recalculates the investigator's skill value from scratch. I believe that this is exactly equivalent to returning to ST.5, although I don't think it is necessary for you to formally do so (if it ever matters).

As the Questions rises in the BGG Forum, i think 2x Lucky is possible too:

(copied my answer from the bgg Forum):

Quote

I think, 2x Lucky + Dark Horse works, IF you are at -5 when determining Failure in ST.6 and have exactly 2 Ressources

1.) You would fail --> Condition for Lucky is met.
As there is no Limit how many Cards you can play in the Player Window, you can play both Lucky

(normally there is no player window at this step, but due to the text on the Lucky Card, a Player window is available, otherwise, there would be no possibilty to play even the first Lucky. However, only cards that have the same trigger can be played here (<if you would fail>, which also prevents OTHER players to play cards, as they not would fail (there is no skill test for other players they could fail))

2. ) You would be at -1, but as the Dark Horse effect is constant as there is no explicit timing stated to check for the +1, at the same time as you spend the Resource for the second Lucky, you get +1

--> After you played both Lucky! (specifically, after the above Player window ends) St.6 ist rechecked (you have to, otherwise Lucky would generally have no effect), now you are at +5 and succeed