Veil of Birds
Enchantment
When an opponent casts a spell, if Veil of Birds is an enchantment, Veil of Birds becomes a 1/1 Bird creature with flying.
When wind marries sky, even the bride's veil sings her praises.
イラスト：
Urza's Saga#106コモン英語適正
裁定
2004年10月4日
When it turns into a creature, it is no longer an enchantment.
2004年10月4日
It changes into a creature even if the spell is countered.
2004年10月4日
It triggers when the spell is cast, which means it becomes a creature before that spell resolves.
2008年8月1日
A noncreature permanent that turns into a creature can attack, and its 
abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn’t matter how long the permanent has been a creature.