Titania's Song

Enchantment    (CMC:4)

Each noncreature artifact loses all abilities and becomes an artifact creature with power and toughness each equal to its converted mana cost. If Titania's Song leaves the battlefield, this effect continues until end of turn.

170 ME4 • ENKersten Kaman

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Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

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.