hallo, hallo.
you delegate summoners like you delegate sp. the person you delegate to can use the summoners, but they don't own them.
the summoner i sent you will increase the magic attack of your monsters by one, so try to use magic attack monsters, but not only magic attack monsters.
you have to balance it. you will learn by playing. i have spent hundreds of hours playing
it is best to put a melee attack monster at first position. melee attack is the monster with the ninja thingy. then you put anything else you like