The castle is small, and there is not enough room for everyone. 
You must try to place all of your characters in the castle before
your opponents do. In order to accomplish this you will have to
plan carefully and place your characters intelligently. 
When properly used, your characters can pave the way for more
of your characters to enter the castle while keeping your
opponents out. However, your opponents have characters that
are just as powerful as yours. Some can eject and return to your
hand those which you have already placed. 
Let the scuffle begin!