Curse of Vitality
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Cheapest priced copy (Commander 2017): $1.49 at Card Kingdom, near mint, their price list as of .

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Curse of Vitality {2}{W}

Enchantment — Aura Curse · Uncommon · Commander 2017 · #3

Enchant player

Whenever enchanted player is attacked, you gain 2 life. Each opponent attacking that player does the same.

Legal inCommanderLegacyVintage

Not legal inBrawlStandardPioneerModernPauper

1 printing · $1.49 at Card Kingdom
SetNumberRarityCard KingdomFoil
Commander 20173Uncommon$1.49—
4 rulings from Wizards of the Coast
  1. 25 August 2017Each Curse’s ability triggers only once, no matter how many creatures are attacking the enchanted player.
  2. 25 August 2017A player is attacking another player if they control a creature that’s attacking that player. If no creatures are attacking the enchanted player as a Curse’s ability resolves (most likely because they’ve left the battlefield), only the Curse’s controller performs its actions.
  3. 25 August 2017If you enchant yourself with one of these Curses, you’ll get its effects whenever another player attacks you.
  4. 25 August 2017The triggered ability of these Curses won’t trigger if only a planeswalker controlled by the enchanted player is attacked.