Your search for "Enduring Tenacity 374" revealed the following:
Enduring Tenacity - Extended Art (DSK) from Duskmourn: House of Horror, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Isis Card Text:Whenever you gain life, target opponent loses that much life.When Enduring Tenacity dies, if it was a...
Enduring Tenacity - Extended Art (Foil) (DSK) from Duskmourn: House of Horror, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Isis Card Text:Whenever you gain life, target opponent loses that much life.When Enduring Tenacity dies, if it was...