Karn, Silver Golem
Legendary Artifact Creature - Golem | Power/Toughness: 4 / 4
Whenever Karn, Silver Golem 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 converted mana cost until end of turn.
Set: [USG] Urza's Saga ( R · #298 )