after playing season of bold exile 4 card from the top, crab was one of them
first I tried to play him with emerge because I had Harnfel in play, the game wouldn't allow me to select anything
then on the other turn I tried to cast crab full cast from exile, game was asking me to "select 1 for emerge"
then after trying 3 times by canceling the cast, I was stuck with "select 1 for emerge" text and couldnt do anything