Fear of Winter reads "Each player cannot play or put into play more than 1 card from his or her hand until you reveal a new plot card."
Darkstar reads: "If Darkstar would be discarded from your hand or deck,put him into play instead."
I marshal, and play a card. I have one card in my hand, Darkstar. My opponent wins an INT challenge against me, which would discard Darkstar. Normally, FOW does not permit a second card to be put into play from hand. Normally, Darkstar would be put into play here.
Both cards are not optional, or responses. They are mandatory. What happens?