The summary of the picture is: A Muslim warrior with a sword in one hand and the Koran in the other.
Sac
The other most common image is death walking with the scythe, the Grim Reaper. The Tarot de Marseilles uses that image, as does Aleister Crowley's Thoth deck.
Thoth deck:
Marseilles deck:
There are a lot of other limited distribution decks around with other images, but these three between them cover probably 99.9 percent of the decks in existence.
I don't think this has any occult significance here. The shooter (if he and not some thrill-seeking teenager dropped the card) just probably thought this would aggravate and frighten everyone.