Karn, Legacy Reforged [March of the Machine: The Aftermath] Guff Whenever Cavern-Hoard Dragon deals combat

Whenever Cavern-Hoard Dragon deals combat damage to a player

Enchantments you control are Gold artifacts in addition to their other types and have "Sacrifice this artifact: Add one mana of any color

Activate this ability only once

{T}: Add {C}

even with sunlight still shining in the sky

Karn, Legacy Reforged [March of the Machine: The Aftermath] Guff Whenever Cavern-Hoard Dragon deals combatSet: March of the Machine: The Aftermath Type: Legendary Artifact Creature Golem Rarity: Mythic Cost: {5} Karn, Legacy Reforged's power and toughness are each equal to the greatest mana value among artifacts you control. At the beginning of your upkeep, add {C} for each artifact you control. This mana can't be spent to cast nonartifact spells. Until end of turn, you don't lose this mana as steps and phases end.