The standard promo set cards are available from expos and convention, seeing new Disney movies at cinemas, Lorcana League, set championship events, and other methods
The exact probabilities aren't known for the likeliness of pulling an alternate artwork card but it has been approximated that the chance of a non-Secret Rare Alternate Art is 0.30-0.35% and for a Secret Rare for there to be a 0.12% chance it's an Alternate Art
It has event details, articles, and useful information about the history of the game
Call upon crafty ninjas, tell incredible sagas that spring to life, and reconfigure your creatures into powerful weapons
There are 4 ways to clear clues from assets: dropping the clues on her assets back in her location (which means she has to pick them up again), discarding the assets with clues on them (which means she needs to find a replacement or replay a copy), using either "Aetheric Current" (and she needs to find an enemies to target with the event) or advance the act and/or spend clues specifically on her assets first