Karn, Silver Golem [Arena League 1999] HNT003 As long as a card

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

Set: Duskmourn: House of Horror Type: Enchantment — Room // Enchantment Rarity: Mythic Cost: {2}{B} // {6}{B}{B} Funeral Room

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

Crackling and blazing

You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells that you cast

Karn, Silver Golem [Arena League 1999] HNT003 As long as a cardSet: 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.