Karn's Touch #86
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Card Details
Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.
Illustrated by Alan Pollack
Rulings (1)
Aug 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 their most recent turn. It doesn't matter how long the permanent has been a creature.