Uri:
The description for Arcane Art says that I cast a spell on "an ally," so I'm not sure if I can use it on myself or not, but if so then I'm doing it to heal another 1d8. I won't roll yet, so that doesn't accidentally influence the answer...
Harlin Greenarrow:
Uri,
There are several instances in the moves of "you or an ally," so I suspect if it just says "an ally," you're out of luck.
Uri, in general, we will go with what Harlin has described. Which means normally your Arcane Art does not work on yourself. However, in the current situation I will let you roll for it if you desire, because it is flavorful. If you roll a 7 or higher, "your magic reverberates to other targets affecting them as well." In this case, it reverberates to everyone in the room, including yourself. If you get a 6- though, something bad will happen.
On another note, thank you everyone for replying to my questionnaire! I received a lot of useful feedback. I believe it will help me make this game a lot more fun and satisfying for everyone involved. I really appreciate everyone's contributions.