Turtle Rock Studios latest weekend challenge will tally the win percentage of all matches featuring the hunter Hyde and the monster Wraith in their 4v1 monster hunter, Evolve. If hunter teams featuring Hyde win more, then all players who play Evolve online between 12:01 AM ET on Friday, April 24 and 12:01 AM ET on Monday, April 27 will earn the Hyde Predator Skin. If the Wraith has the higher win percentage, then players will receive a Wraith Voodoo Skin. You don't have to play as Hyde or Wraith to participate, just playing online during the times qualifies you, but only matches with both Hyde and Wraith count towards the challenge. More info is on the Evolve website.
Evolve has been running similar challenges and rewarding players with skins for a few weeks now. We've features them before here and here, and the trend looks to continue in the future.