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Legendary Artifact Creature — Golem
Whenever Karn blocks or becomes blocked, it gets -4/+4 until end of turn.
: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.
Power / Toughness
4 / 4
Rarity
Set
Collector #
USG #298
Artist
Released
1998-10-12
CMC
5
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.
wotc · 2008-08-01
The blocking ability triggers only once no matter how many blockers are declared.
wotc · 2004-10-04
