Karn, Silver Golem

Karn, Silver Golem {5}

Legendary Artifact Creature - Golem | Power/Toughness: 4 / 4
Whenever Karn, Silver Golem blocks or becomes blocked, it gets -4/+4 until end of turn.
{1}: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its converted mana cost until end of turn.