What strikes me is the centrality of the MTG game to the case. It is why Joe had his freinds over that night, it was the subject of his last known phone conversation, and of course those rare cards were among the items that went missing with Joe. What happened "in game?" Sometimes the world of make-believe and fantasy can become tragically real.
"Columbine High School sophomore Jason Jones observed the Trench Coat Mafia playing 'magic' cards in the cafeteria, which were about the devil and about power."
(pg1474 of the Jefferson County(CO) evidence release)