In a large mixing bowl, combine 4 cups of grape juice, 1 cup of orange juice, and 1 cup of pineapple juice. Stir gently for about 30 seconds until the juices are well blended.
Slowly pour in 2 cups of lemon-lime soda into the juice mixture just before serving. Stir gently for about 10 seconds.
Carefully transfer the punch into a large punch bowl or an eye-catching cauldron.
Sprinkle in ½ cup of gummy worms, allowing them to float on the surface of the punch.
Fill glasses with ice cubes and ladle the Witch’s Potion Punch over the top to serve.
Notes
Keep gummy worms from sinking by adding them just before serving. Chill all ingredients for best flavor.