Karn, Legacy Reforged [March of the Machine: The Aftermath] M-20 then sacrifices seven permanents

then sacrifices seven permanents

The same is true for artifacts and enchantments

Then the walls began to glow

Set: World Championship Decks 2003 Type: Land Rarity: Uncommon {T}: Add {G}

Set: Power Keepers Type: Water Rarity: Ultra Rare Retreat cost: 1 [1WW] Whirlpool (40)

Karn, Legacy Reforged [March of the Machine: The Aftermath] M-20 then sacrifices seven permanentsSet: 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.