
The wording on this card implies that if you are doing an action, have a lighting bolt window, and the shroud of your location is zero, you can exhaust Alton to gain a clue without spending any evidence.
It seems like the obvious choice for this ally to land would be in a difficulty zero cluever or flex deck. This would be especially effective in a difficulty zero Darrell deck, as you could get some free evidence from it as well. Which seems extremely strong, especially in a level 0 deck and for enabling this archtype.