Mortal Obstinacy
Enchantment — Aura
Oracle Text
Enchant creature you control Enchanted creature gets +1/+1. Whenever enchanted creature deals combat damage to a player, you may sacrifice this Aura. If you do, destroy target enchantment.Rules for this card
Rulings (2)
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Wizards of the CoastIf another player gains control of the enchanted creature, Mortal Obstinacy will be put into its owner's graveyard.
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Wizards of the CoastYou decide whether to sacrifice Mortal Obstinacy as its triggered ability resolves. If it's not on the battlefield at that time, you can't sacrifice it and destroy the target enchantment.