Many bosses are susceptible to it
For more detailed information on how to play, the mechanics of the game, and the different sets available, you can visit the official Disney Lorcana website by Ravensburger
Having eight of these cards in your deck makes it relatively likely you are going to find it on your first turn, and it also makes piloting this deck easier
So unlike Sleepy's Flute, which gains you only 1 lore per turn instead of 1 lore per song, there is no limit to how much lore you can get from Alan in a turn
If you combine these three cards with Nightscape Familiar, you'll get a simple, fast win condition that creates infinite Warlock tokens
Take care, and Ill catch you next time