Karn, Silver Golem [Urza's Saga] Plant Wall Chains of leaping fire and

Chains of leaping fire and sizzling lightning laid waste the artificers' handiwork

Whenever Qasali Slingers or another Cat enters the battlefield under your control

All things will crumble

the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step

" —Imran

Karn, Silver Golem [Urza's Saga] Plant Wall Chains of leaping fire andSet: Urza's Saga Type: Legendary Artifact Creature Golem Rarity: Rare Cost: {5} 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.