She doubles your ETBs
You can only use each of the following effects of "Lib the World Key Blademaster" once per turn
Three, its ridiculously easy to search them from your deck, so you get it almost every game even when you run 2 copies, and its almost preferable to search it as opposed to drawing it because it contributes to bad opening hands
Additionally, Rare cards are also able to come in the Reverse Holo format, which would be in addition to the guaranteed Rare that is already included in the booster pack
Exact Words: As clarified in the FAQ, she can include cards in her deck as long as they contain words "heals horror", even if it means they heal it on themselves (like Peter Sylvestre, a Survivor-class "Ally"), or in very specific circumstances (like "Cheat Death", a Rogue-class card which triggers on defeat via damage or horror, restoring a portion of health and sanity)
I hope you find these cards fun and have some thoughts based on seeing the flavour and mechanics I had in mind for em.