The play A Midsummer Night's Dream is teeming with elements of the supernatural. First of all, much of the action in the play occurs in a magic forest filled with fairies and sprites. These magical creatures have some pretty fantastic powers, too. For example, Puck transforms Bottom into an ass--literally, and then later returns him to his former human state.
Another very important bit of magic in the play is the existence and use of a mystical flower that releases a nectar which causes whoever has the juice dripped in his or eyes to fall madly in love with the first being they see. Puck and Oberon use the magic nectar to play a prank on Titania and to help Helena win her love (with a few bumps along the way).
For a good summary of the play, check out the link below: