Karn, Legacy Reforged (Foil Etched) [March of the Machine: The Aftermath] 000 As a planeswalker

As a planeswalker

Armed with exceptional magical powers

and/or Mugenshi: RELEASE from your graveyard into your deck

−5: Artifacts you control become artifact creatures with base power and toughness 5/5 until end of turn

Karn, Legacy Reforged (Foil Etched) [March of the Machine: The Aftermath] 000 As a planeswalkerSet: 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.