Chapter 2 review
It appears 3 XP is the new benchmark for clue compression events outside the Seeker class, with other examples including Stakeout and Right Under Their Noses. For me, I don't actually mind this XP pricing - I think in Chapter 1 clue compression was by and large too easy (e.g. compare to 0 XP Read the Signs), so putting a sizeable XP price tag on compression is a nice balancing effect.
Even so, there's plenty of other cards Mystics want, so is this worth it with respect to the wider Chapter 2 card pool? To that I say... maybe. For one, it gives you a very good chance to crack a high shroud location by adding to for the investigation - and once you pass that test then you get two clues off the location. 2 resources doesn't seem too steep for this effect.
The extra "if" effect I see as icing on the cake, and there are some nasty new Hex (Langour) and Terror (Unspeakable Truths) treacheries in the core it can target (while also able to target relevant treachery weaknesses such as Pursued). There are enablers of this in the Mystic kit (e.g. Premonition, Sacrificial Doll, Mask of Silenus), with Premonition being the lowest effort of the three. I don't think you necessarily need to trigger this effect for Augur to worthy however.
In terms of close competition, there's upgraded Second Sight. I tend to find this a bit expensive for what it is, as it doesn't net you more clues than basic Second Sight. The benefit of Augur is it will actually make your Second Sight charges go further, so I'd say it's complementary. For synergy, there is Ritual Dagger - but as it shuffles the event back into your deck you need someone who can rattle through their deck quickly to make this work (e.g. Marie Lambeau).
Conclusions: It's worth consideration on Mystic decks focused on clue-finding, and/or for an event focused deck with Ritual Dagger. Otherwise, it's probably worth a miss on most decks (and it's not worth it at all on decks using the a wider legacy card pool).