There is a shadow effect on this card that puzzles me. Lightless Passage: "Cancel all combat damage dealt to attacking enemy."
Usually I resolve the shadow effect immediately. Here, that does not seem possible unless I don't understand how it works. At the instant I "resolve" the effect, there is no discernible combat damage on the enemy. Oh, there might be old damage from before, but one cannot distinguish between combat damage and any other damage, so that can't be right. I'm guessing the effect means to say: "Cancel all combat damage this enemy might receive in the upcoming attack." Also which damage is not combat damage to a enemy?
Maybe why shadow cards aren't discarded until the end of the phase is the key. Usually I just discard them right away.
This brings me to a second card's Shadow effect. Patrol Leader. "Cancel all damage dealt to this enemy." This is where I get really puzzled. Does this mean to only remove damage that is already on the enemy? Cancel all upcoming damage to be dealt to this enemy this turn (and leave the old damage alone)? Or what?