Enduring Tenacity DSK/374

Set: Duskmourn: House of Horror
Collector Code: DSK/374
Name: Enduring Tenacity
Type: Enchantment Creature — Snake Glimmer
Oracle text: Whenever you gain life, target opponent loses that much life. When Enduring Tenacity dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment. (It's not a creature.)
Rarity: Rare