The Mistake With The "Drowned" Event.
You made it so that you have to win a game as, or with Pyke, a new champion.
Now i guess riot doesn't know this but for the first 2 weeks a champion is out, their basically pick or ban in normal games, the most likely place you'd be playing a new champion. So it makes completing these missions pretty hard, i'v always found it frustrating that we can't stop people from banning a new champion(IN NORMALS), that's why new releases are always pretty crappy to be honest. Couple that with an Event that requires him and boom, the event isn't fun and is really hard to complete.