Might be kind of niche but I am building a Kymani Jones deck with this, Chuck Fergus and Bum's Rush. With the starting 5 xp you can take 2x Chuck and 3x Doppelgänger. For 4 resources and no action (or 2 resources and an action) you can discard any non-elite enemy by playing this in your room then Bum's Rush to push them out and trigger the second evade (you have to succeed 2 evades at 7 skill, but that's not too difficult and the 1 damage from Bum's Rush reduces the difficulty of Kymani's discard evade test). If you fail the first evade you still move them and get a second chance to evade from Doppelgänger.

Can also work nicely with "Where's the party?" to discard non-elites from the encounter deck. Drop a doppel in room, spawn an exhausted enemy and then evade them instantly to discard. 2 resources and an action, with Chuck able to reduce either the resources or actions needed to 0.

It's not overpowered by any means, but it is pretty neat that both of the crucial cards (Chuck is luxury here really) come from the same set, which matters as I have moved on to playing limited environment for extra challenge.

Dirty Fighting doesn't specify "at your location" so ... you can trigger Doppelgänger to evade an enemy from an other location and then trigger Dirty Fighting to fight it, right ? Even if this enemy is Aloof.

On the opposite, Lucius Galloway gets the clue at his location.

I think a more standard use is to put it in a deck that gets clues thanks to the presence of an enemy (Fake Credentials, Followed, ...) : you lay Doppelgänger on high-shroud locations and when an enemy enters one of them, you teleport there to try to get the clues. And you can eventually combine it with Obscure: teleport to the location, engage, evade, and then get your clues.

Edit: As indicated below, you can't fight from an other location with Dirty Fighting if you don't have an effect that allows you to fight from an other location.

There's enormous flexibility here. For example, you could tuck one of these on the same location as the clue-ver and immediately pop in when an enemy shows up to menace them. I think the best value here is if all of the options could potentially be useful.

That said, Easy Mark is more generically beneficial if you are looking for a Myriad Trick to put on Bewitching and trigger a few deck-thinning searches.