Just 36 copies of the holographic Masters Key prize card were ultimately handed out to the finalists in both the trading card games finals and the video game competitions held at the event - eight in the TCGs Junior category, six TCG Senior and Master trainers, and 16 split evenly across the video games Junior and Senior divisions
Additionally, you can have The Fourteenth Doctor enter the battlefield as a copy of any Doctor card put in your graveyard on that turn
Sold only by the full case of 2,500 - check Ebay and Amazon for less than case quantities
Some cases where people double sleeve their photocards would be because: (1) the photocard may be of significantly higher value than the rest of their collection, (2) the material of the photocard may be thinner than normal - double sleeving would provide more structure due to the thickness or (3) the environment the photocards are kept in may be susceptible to sunlight, moisture or humidity - double sleeving may be able to provide more protection for the photocard
It's a powerful card for a lot of different decks with different cards to unlock
Paired with cards like Life from the Loam, however, and this doesnt feel like as big of a drawback
