Karn, Silver Golem

Karn, Silver Golem

Legendary Artifact Creature - Golem | Power/Toughness: 4 / 4 (CMC 5)
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 mana value until end of turn.