Your search for "Skull Invitation SDMA-EN031" revealed the following:
Skull Invitation - SDMA-EN031 - Common - 1st Edition from Structure Deck: Marik 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:Each time a card is sent to the Graveyard, inflict 300 points of damage to its owner's...
Skull Invitation - SDMA-EN031 - Common - Unlimited from Structure Deck: Marik Unlimited, available at 401 Games Canada. Rarity: Common Card Text:Each time a card is sent to the Graveyard, inflict 300 points of damage to its owner's Life Points...