This is an idea for a spirit that makes shiny wrinklers have a chance to spawn 1/5th of the time (rather than 1 in 10K), with the drawback of making it take 250* longer for any wrinklers to spawn.
Description: "Wards of regular wrinklers and attracts the shiny ones, this, unfortunately, causes them to take far longer to appear."
A potential alternative spell: Converts one of your wrinklers to a shiny wrinkler with a 40% chance to backfire.
Backfire: Activates elder pledge.
A sudden burst of pixel art approaches...