Veil of Birds {U}
Enchantment
When an opponent casts a spell, if this permanent is an enchantment, it becomes a 1/1 Bird creature with flying.
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Cards that do something similar expected a card that isn't here?
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Opal Gargoyle 85%
$0.16#29979
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 Gargoyle creature with flying."
Fable of Wolf and Owl 84%
$8.92#16932
"Whenever you cast a blue spell, you may create a 1/1 blue Bird creature token with flying."
Opal Guardian 81%
$0.19#30162
"When an opponent casts a creature spell, if this permanent is an enchantment, this enchantment becomes a 3/4 Gargoyle creature with flying and protection from red."
Escaped Shapeshifter 81%
$1.09#29308
"As long as an opponent controls a creature with flying not named this card, this creature has flying. The same is true for first strike, trample, and protection from any color."