I encountered this as well. I won, earlier today, a lobotomizer in the oracle. I clicked get card. I also got a nymph as a pet. Someone in the chat had mentioned that when you win a nymph pet, you keep it afterward (maybe that was false?). In any event, after I finished my FG battle, I went to inventory and did not have the nymph or the lobotomizer. Thoughts?
i believe i calculated this once, The chances of getting a nymph are about 6% and the chances of getting a card are (or should be) 50%, but i'm guessing it's probably 20%