16 Mar 2018
All players get to see which card you return to your hand.
16 Mar 2018
Because Haunted Fengraf's ability doesn't target any creature card, any creature card put into the graveyard in response to that ability may be returned to your hand.
16 Mar 2018
The creature card returned to your hand is chosen at random as the ability resolves. If any player responds to the ability, that player won't yet know what card will be returned.