I'm a knight in this game and have picked every hero that has been available to me in the Tavern. I have also sainted 5 of these heroes. Also - I have over 1200 spirits to buy my next hero if need be. To get there I spent an incredible amount of credits, not sure how much, but a lot. Also, it took me about 5 minutes to realize that it was not a 20% chance but a predetermined drop. Once I realized this I did not bitch about it being unfair - I realized if I wanted to play the game I had to play by their rules. I guess the moral to this is if you want the heroes - keep at it and they will eventually hit.