Growth Drive Style (Patreon)

Hey everyone. My budget is getting pretty tight again, so I'm going to need to work on another growth drive. I thought it might be a good idea to make a poll to see what kind of form the drive would take. 

The styles I've tried so far have been:

Single target: An effect happens to a single character, growing stronger as goals are met.
Multi-target: An effect spreads to more characters, as goals are met.
CYOA: Supporters vote on how a story goes as it progresses. 

What style would you guys be most excited to see again?