the Disney MagicBand: used at Disney parks and resorts, these are all-in-one devices that incorporate room key cards, park tickets, and credit card information into a bracelet that guests wear throughout their stay.
if you don't have your own Disney MagicBand: find out how our forum members are helping each other Dragon Gate Unlock Help Requests Topic
exclusive Disney Infinity Toy Box items can be unlocked using a Disney MagicBand, the steps to unlock the items are shown below ...
1: start a Disney Infinity Toy Box session
2: place a Disney Infinity figure on the 1st player spot of the Infinity base
3: place a Disney Magic Band on the 2nd player spot of the Infinity base
at this point a message will display indicating that the Dragon Gate is now available in the Toy Box. after this point the Disney MagicBand serves no other purpose and can be removed from the Infinity base
at random times over the next 30 to 40 minutes, 3 different green capsules will appear. open each capsule to unlock the items. during this recorded Toy Box session the green capsules appeared after 4 minutes, 18 minutes and 32 minutes.
4: open the green capsule containing the Dragon's Keep prebuilt Toy Box
5: open the green capsule containing the Dragon's Flight sky
6: open the green capsule containing the Dragon's Domain textures
after all 3 capsules have been opened, quit the Toy Box session and all items will have been saved and will be available for future use at any time without the need to use the Disney MagicBand
EDIT: here is a look inside the MagicBand