Xenic Poltergeist

Creature — Spirit    (CMC:3)

: Until your next upkeep, target noncreature artifact becomes an artifact creature with power and toughness each equal to its converted mana cost.

104 ME4 • ENDan Frazier

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Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Xenic Poltergeist {1}{B}{B} Creature — Spirit {T}: Until your next upkeep, target noncreature artifact becomes an artifact creature with power and toughness each equal to its converted mana cost. 1/1

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10/4/2004
Wears off at the beginning of the upkeep, not during upkeep.
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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