Partially fulfilling card effects
This is a silly semantic question, but, e.g., Lembas says:
"Discard Lembas to ready attached hero and heal 3 damage from it."
I think I won't be alone in saying that I've used it to heal 2, 1, or even 0 damage, just for the hero readying. But is this technically allowed? We cannot trigger card effects if we cannot pay the cost, like Emery's action with <3 cards in deck. Can we partially fulfill the results of an effect?
There's a relevant FAQ entry that refers to encounter cards discarding
I don't think there was really any doubt about this, but for the record:
(The Prospector question was for the situation when you have <3 cards left in deck.)
Elsewhere, cmabr002 asked about Mirror of Galadriel and <10 cards... It's phrased, "Exhaust Mirror of Galadriel to search the top 10 cards of your deck for a card and add it to your hand. Shuffle the rest back into your deck. Then, discard a random card from your hand." Do you have to discard a random card in this case?