These are cards that cannot be put into your own deck , and they are only used in the Illumineer's Quest Deep Trouble to defeat Ursula from taking over Lorcana
If you're looking for value, aim for Jumbo cards from the Legendary Collection and Skyridge
A lot of mana ramp, some utility creatures, ways to make tokens and steal their stuff and maybe some card draw and you've got yourself a recipe for a 75% deck that's going to steal a lot of their creatures but won't be reliant on them to play creatures since you'll have a lot of your own
People are greedy enough to keep triggering this, so enjoy it
Sometimes the lone duelist gets one turn in-between each of the team's turns, other times they get more Life Points, and in one instance, they got to draw a larger opening hand
Work Together flavor text from the original print run of The First Chapter attributes part of the quote to Pasha when it should be Pacha