On the Reserved List -- Wizards has committed to never reprint these cards.
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Karn, Silver Golem
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Oracle Data
: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.
Official Judge Precedents
The blocking ability triggers only once no matter how many blockers are declared.
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.
