Illusionary Armor 

Enchantment — Aura
Enchant creature
Enchanted creature gets +4/+4.
When enchanted creature becomes the target of a spell or ability, sacrifice this Aura.
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Cards that do something similar expected a card that isn't here?
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Sleeping Potion 100%
$0.14#29365
"When enchanted creature becomes the target of a spell or ability, sacrifice this Aura."
Spectral Prison 98%
$0.05#29536
"When enchanted creature becomes the target of a spell, sacrifice this Aura."
+1 more matching line