As I read in an older thread there is the general idea that Black Knights of Morr can trigger there own ability when come into play just like The Greatswords
The Greatswords ability:
Forced: After a unit enters this zone, The Greatswords gains l until the end of the turn.
Black Knights of Morr ability:
Knight.
Action: When a unit enters this zone, target unit cannot defend until the end of the turn.
I cannot understand why this is possible. In order to activate an action on a card unit the card has to be in play, right???
So at the time that you activate the action of Black Knights of Morr it has to be in play. So there is no coming in to play card into the stuck in order to have a legal target for this ability. In the case of The Greatswords we do not have an Action but a Forced Effect which I guess works differently and this is why The Greatswords activate by them self. Am I wrong? Do I miss something? Please correct me.
P.S. I' ve also sent this question to the support team in the past but never got an answer :-(