
Wendy loves fast events, and the ability to play them twice in the same turn (or just twice when needed) gives the event soooooo much value. Now, a zero-cost fast event is just gravy, now you don't even have to pay for it!
I've actually played a Blessed Wendy once, and the deck overperformed a lot, it really surprised me. Tempt Fate and Keep Faith were two of my most powerful cards, I drew positive with Tempt Fate, and completely filled the bag with Keep Faith for my A Watchful Peace (which if you're not playing taboo and have a lot of blesses you can play two Mythos in a row and laugh histerically). If I had had access to this card back then, it would've been a no-brainer.
Ok, so I’ve just realized that I’ve been playing Wendy wrong all along. My brain autofilled Wendy’s Amulet forced ability to only work on events on the discard pile… for some reason.
Even with all this, the deck is way less degenerate, but I believe it would still work.