The rules say add 1 or 2. I’m thinking I’ll just add 1 for 3-4 players and 2 for 5-6 players. Seems like it’s entirely up to you though.
So 1-2 for each season? I think 1 for 3-4 and 2 for 5-6 is probably fair.
Also, the Godzilla one looks insane. Bonsai clan is going to wreck Turtle with it.