0xp: Empirical Hypothesis is almost similar as Lucky Cigarette Case. Let's assume we always choose the criteria "You succeed at a test by 3 or more," since this criteria is more robust to trigger than the other. Then, Empirical Hypothesis is just non-slot LCC(0). Of course, we need 1 additional succeed and cannot trigger during just played round (since we choose the criteria at the start of the round). However, we can choose the timming of the draw. It's useful if we want to shuffle the thin deck just before resolving the weakness or shuffle empty deck before searching the deck. For easy/standard difficulty, 0xp version is still good and even hard difficulty I think gooda.
0xp is enough good, so we may not upgrade this card. The below part is related to the upgrade and just as reference.
3xp: I suggest the 3xp upgrade as Field Research + Peer Review. It's a note that the criteria is chosen at the start of the round, before the encounter cards are drawn during the mytho phase. In this reason, it's hard to guess which criteria is suitable. I think, Field Research + Peer Review is easy to trigger. With Field Research + Peer Review, Empirical Hypothesis is triggered if we're in the location with 3+ shroud and another investigator is in our locationb.
Another upgrade candidates:
- Alternative Hypothesis(4xp): For multiplayer, we have two great criteria: Field Research, 3+ succeed. One problem is that we check which one is first and choose one.
- Research Grant(2xp): If you have not enough money source, this upgrade gives backup plan. This upgrade converts 2 cards into 3 resources, which is common trade ratio in AHLCG. Considering 2xp upgrade, it's not efficient trade but fair trade (or backup plan).
- One criteria considering your group: If we upgrade all above, Empirical Hypothesis is now 9xp and we have Peer Review. For easlier triggering of Alternative Hypothesis, one additional criteria is good, IMO. For instance, Trial and Error with Mark. Independent Variable is also considerable as second criteria with Alternative Hypothesis.
I do not recommand Irrefutable Proof. Commonly, drawing 3 cards is valuable than discovering 1 cluea.
a) I has not play expert difficulty. This may not true for expert difficulty.
b) Since the text states "when the chosen criteria is met", this ruling may be wrong. IMO, when is not meaning as triggering timing considering the movement of the unrevealed location.