By Samantha Highfill
Updated April 21, 2016 at 08:20 PM EDT
Maarten de Boer/Getty Images

When Supernatural‘s Misha Collins isn’t playing Castiel, well, he’s playing Cassifer. But with season 11 of the show headed toward its conclusion, Collins is launching the fifth annual GISHWHES, which stands for Greatest International Scavenger Hunt the World Has Ever Seen.

The Guinness World Record-breaking scavenger hunt features teams from all over the world that take on a list of more than 200 items — previous acts included hosting a tea party at a children’s hospital or creating portraits of Taylor Swift out of rice and legumes — completing what they can and posting photos or videos of their completed items to the GISHWHES website. And at the end of the hunt, the winning team of 15 members will accompany Collins on an all-expenses-paid trip to Iceland.

This year’s hunt will take place from July 31 to August 6, and registration is now open. Founded in 2011, GISHWHES is the largest single contributor to the Random Acts, a nonprofit dedicated to conqueing the world one random act of kindness at a time.