Veiled Apparition

Enchantment    (CMC:2)

When one of your opponents successfully casts a spell, if Veiled Apparition is an enchantment, Veiled Apparition becomes a 3/3 creature with flying and "During your upkeep, pay or sacrifice Veiled Apparition" and that counts as an Illusion.

107 UZ • ENAndrew Robinson

™ & © 1993—1998 Wizards of the Coast

Legal in: Urza Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Veiled Apparition {1}{U} Enchantment When an opponent casts a spell, if Veiled Apparition is an enchantment, Veiled Apparition becomes a 3/3 Illusion creature with flying and "At the beginning of your upkeep, sacrifice Veiled Apparition unless you pay {1}{U}."

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View this MTG card on Gatherer

10/4/2004
You choose whether to pay or not on resolution. If not, then you sacrifice the creature. You can choose to not pay if you do not control the creature on resolution.
10/4/2004
When it turns into a creature, it is no longer an enchantment.
10/4/2004
It changes into a creature even if the spell is countered.
10/4/2004
It triggers when the spell is cast, which means it becomes a creature before that spell resolves.
8/1/2008
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 his or her most recent turn. It doesn't matter how long the permanent has been a creature.

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Card Veiled Apparition is not on TCGPlayer.