Your search for "Guardian Sphinx SD7-EN005" revealed the following:
Guardian Sphinx - SD7-EN005 - Common - 1st Edition from Structure Deck: Invincible Fortress 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:Once per turn, during your Main Phase, you can flip this card into face-down Defense Position....
Guardian Sphinx - SD7-EN005 - Common - Unlimited from Structure Deck: Invincible Fortress Unlimited, available at 401 Games Canada. Rarity: Common Card Text:Once per turn, during your Main Phase, you can flip this card into face-down Defense Position. When this...