Karn, Silver Golem [Arena League 1999] HNT003 you may have Lazav become

you may have Lazav become a copy of a creature card exiled with it until end of turn

Set: From the Vault: Legends Type: Legendary Creature — Gorgon Rarity: Mythic Cost: {3}{B}{B}{B} Flying

Set: Scourge Type: Enchantment Rarity: Rare Cost: {2}{U} Whenever a creature dies

As long as a card exiled with Duplicant is a creature card

Karn, Silver Golem [Arena League 1999] HNT003 you may have Lazav becomeSet: Arena League 1999 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 mana value until end of turn.