FOILCheapest priced copy (Duskmourn: House of Horror): $17.99 at Card Kingdom, near mint, their price list as of .
Enduring Tenacity 
Enchantment Creature — Snake Glimmer · 4/3 · Mythic · Duskmourn: House of Horror · #390
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.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
6 printings · $17.99 to $279.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror | 95 | Rare | $17.99 | $17.99 |
| Duskmourn: House of Horror | 374 | Rare | $18.99 | $19.99 |
| Duskmourn: House of Horror | 390 | Mythic | — | $74.99 |
| Duskmourn: House of Horror | 400 | Mythic | — | $279.99 |
| Duskmourn: House of Horror Promos | 95p | Rare | $17.99 | $17.99Out of stock |
| Duskmourn: House of Horror Promos | 95s | Rare | — | $21.99 |
7 rulings from Wizards of the Coast
- 20 September 2024Each creature with lifelink dealing combat damage causes a separate life-gaining event. For example, if two creatures you control with lifelink deal combat damage at the same time, Enduring Tenacity's first ability will trigger twice and you may choose a different opponent for each trigger. However, if a single creature you control with lifelink deals combat damage to multiple creatures, players, planeswalkers, and/or battles at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will trigger only once.
- 20 September 2024A token that's a copy of Enduring Tenacity won't return to the battlefield when its last ability resolves.
- 20 September 2024If a nontoken permanent that's a copy of Enduring Tenacity dies while it's a creature, it will return to the battlefield as an enchantment when its last ability resolves. It won't have any card types other than enchantment.
- 20 September 2024If you gain an amount of life "for each" of something, that life is gained as one event and Enduring Tenacity's first ability triggers only once.
- 20 September 2024If an ability triggers whenever an opponent loses life and its effect causes you to gain life, such as the ability of Exquisite Blood, this will loop until either you win the game or a player takes an action to break the loop.
- 20 September 2024In a Two-Headed Giant game, life gained by your teammate won't cause Enduring Tenacity's first ability to trigger, even though it caused your team's life total to increase.
- 20 September 2024Snake and Glimmer are both creature types. Enduring Tenacity won't have those creature types when its last ability returns it to the battlefield because it won't be a creature.