First printed in March of the Machine: The Aftermath (2023)
All 5 prints
Log in to choose your favorite print: the site shows it in your decks, in the search and in the simulator.
Legendary Artifact Creature — Golem
Karn's power and toughness are each equal to the greatest mana value among artifacts you control.
At the beginning of your upkeep, add 
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.
*/*
- Illustrated by
- Grzegorz Rutkowski
- Watermark
- Desparked
Legality
- Legal in
- Pioneer, Modern, Legacy, Vintage, Historic, Timeless, Penny Dreadful, Gladiator, Commander, Duel Commander, Oathbreaker, Brawl, Competitive Brawl
- Not legal in
- Standard, Pauper, Future Standard, Alchemy, Premodern, Old School 93/94, Pauper Commander, PreDH, Tiny Leaders, Standard Brawl
Rulings (3)
- The mana produced by Karn's last ability can be spent on anything that isn't a nonartifact spell. This includes casting artifact spells, paying costs to activate abilities of both artifact and nonartifact permanents, paying ward costs, and so on.
- Karn's last ability isn't a mana ability, even though it adds mana. It uses the stack and it can be responded to. Use the number of artifacts you control as the ability resolves to determine how much mana to add.
- The ability that defines Karn's power and toughness works in all zones, not just the battlefield. As long as Karn is under your control and still an artifact, its own mana value will count. In most cases, it'll be at least 5/5.
Prices
MTGO price: 0.006 TIX, the cheapest non-foil print (average sell price on GoatBots, 1 Nov 2026).
Combos
17 combos, the most popular first:
- Infinite colorless mana that can't be spent to cast nonartifact spells: Karn, Legacy Reforged + The Peregrine Dynamo + Voltaic Construct
- Infinite colorless mana that can't be spent to cast nonartifact spells, Infinite mana artifacts you control can produce…: Basalt Monolith + Clock of Omens + Karn, Legacy Reforged + Lithoform Engine + Staff of Domination
- Infinite card draw, Infinite colorless mana that can't be spent to cast nonartifact spells…: Basalt Monolith + Clock of Omens + Karn, Legacy Reforged + Staff of Domination + Strionic Resonator
- Infinite colorless mana that can't be spent to cast nonartifact spells, Infinite mana artifacts you control can produce…: Basalt Monolith + Clock of Omens + Grim Monolith + Karn, Legacy Reforged + Lithoform Engine
- Infinite colorless mana that can't be spent to cast nonartifact spells, Infinite untap of artifact creatures you control: Karn, Legacy Reforged + Karn, Silver Golem + Lithoform Engine + Voltaic Construct
- Infinite colorless mana that can't be spent to cast nonartifact spells, Infinite mana artifacts you control can produce…: Basalt Monolith + Clock of Omens + Grim Monolith + Karn, Legacy Reforged + Strionic Resonator
- Infinite colorless mana that can't be spent to cast nonartifact spells, Infinite mana artifacts you control can produce…: Clock of Omens + Grim Monolith + Karn, Legacy Reforged + Lithoform Engine + Staff of Domination
- Infinite colorless mana that can't be spent to cast nonartifact spells, Infinite mana artifacts you control can produce…: Clock of Omens + Grim Monolith + Karn, Legacy Reforged + Staff of Domination + Strionic Resonator
- Infinite colorless mana that can't be spent to cast nonartifact spells, Infinite untap of artifact creatures you control: Karn, Legacy Reforged + Karn, Silver Golem + Strionic Resonator + Voltaic Construct
- Infinite card draw, Infinite colored mana…: Chromatic Orrery + Filigree Sages + Karn, Legacy Reforged + Lithoform Engine