I played Season of the Bolds and choose to exile four cards from the top of my library. I played every of them, but I cannot play the Overlord of the Boilerbilges. I tried to choose every option I can lot of times but no one was working (neither impending one) and only the message "(Cast with Season of the Bold) Select 1" came out.
I had enough mana for sure (2 from Chandra + 5 treasures), the turn after I tried again with all my lands untapped but I got the same error message.