The five card types are: Characters (your primary units Quest or Challenge), Items (permanents that provide ongoing effects), Actions (one-time spell effects), Songs (a subset of Actions that can be "sung" for free by a character with sufficient cost), and Locations (place cards where characters can move and generate Lore passively)
Mind Stone ($4) Some versions of this card are over $10, and they are far less pretty than this is
The First Chapter All 216 cards from The First Chapter, the first Disney Lorcana set that was available to the public
Drop this before your next challenge and see your rivals own defences crumble while yours holds strong.
Stores can do so as well, as many players pointed out in the comments
If you play one of these two cards, you will lose the game because you must draw a card and have no cards left to draw