You know that thing that players do, when the Cleric wants to heal the entire party after a fight? Rather than cast the spell on each player, which kinda pulls us out of the story, I made this move:
When you call on your god to heal the entire party while resting, roll +Wis.
On a 10+, your petition is fulfilled.
On a 7-9, choose one:
...it exhausts you. Take -1ongoing until your next rest.
...your god demands something in exchange, a favor or tribute. The GM will tell you what.
On a Miss, your constant need has angered your diety in some way.
What do you think? It was pretty fun when we used it.