Karn, Legacy Reforged
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.
- CMC
- 5
- Mana cost
- Color identity
- C
- Rarity
- mythic
- Set
- March of the Machine: The Aftermath
- Price
- —
- EDHREC rank
- #2564
Karn, Legacy Reforged enters as a artifact creature whose power and toughness each equal the highest mana value among artifacts you control, then immediately generates a Powerstone token — meaning a well-stocked artifact board can make him a 10/10-plus that pays for himself on the spot. The cost is that he lives in the same threat bracket as your other haymakers and dies to the same removal; Voltaic Construct and Aloy, Savior of Meridian both run him precisely because those decks can protect him long enough to snowball.
Best Commanders
Commanders with the highest synergy
Aloy, Savior of Meridian
Aloy, Savior of Meridian runs a dense artifact package where Karn, Legacy Reforged frequently enters as one of the largest bodies on the board and his Powerstone immediately accelerates the next threat in hand — 43% of Aloy decks include him, the highest rate of any commander.
Chiss-Goria, Forge Tyrant
Chiss-Goria, Forge Tyrant's five-artifact affinity trigger can reduce Karn, Legacy Reforged to near-zero mana, letting you drop a massive body and a Powerstone essentially for free while Chiss-Goria refills your hand.
Lara Croft, Tomb Raider
Lara Croft, Tomb Raider's artifact-matters gameplan values the Powerstone Karn, Legacy Reforged produces as repeatable colorless acceleration that can activate Lara's own abilities without tapping creature mana.
Dawnsire, Sunstar Dreadnought
Dawnsire, Sunstar Dreadnought decks lean on high-mana-value artifacts to inflate Karn, Legacy Reforged's stats, turning him into a creature that frequently matches or outclasses Dawnsire itself in raw size while generating additional mana each turn.
Urza, Lord Protector
Urza, Lord Protector cuts the cost of artifact spells across the board, making Karn, Legacy Reforged cheaper to deploy while Urza's own high mana value boosts Karn's power and toughness the moment he hits the battlefield.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | legal |
| standard | not legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
Commander is where Karn, Legacy Reforged does his best work — artifact-heavy strategies have the density of high-mana-value permanents needed to make him a 8/8 or better, and the Powerstone token compounds over multiple turns in a format where games go long. In Modern and Pioneer, the artifact synergy shells exist but the formats move too fast for a five-mana legendary that does nothing the turn you cast him beyond generate a single Powerstone; he sees only fringe play there. Legacy and Vintage have the raw power to abuse Powerstone acceleration, but those formats already have degenerate mana options that make Karn, Legacy Reforged look fair by comparison, limiting his relevance to niche Karn-tribal or Urza-adjacent builds.
Key Combos
Combo lines featuring this card
Karn, Legacy ReforgedVoltaic ConstructThe Peregrine Dynamo
Infinite colorless mana that can't be spent to cast nonartifact spells
View on Commander Spellbook ↗
Karn, Legacy ReforgedLithoform EngineClock of OmensStaff of DominationBasalt Monolith
Infinite colorless mana that can't be spent to cast nonartifact spells; Infinite mana artifacts you control can produce; Infinite untap of artifacts you control; Infinite colorless mana; Infinite lifegain triggers; Infinite lifegain; Infinite card draw; Infinite untap of creatures you control; Infinite draw triggers; Infinite mana creatures you control can produce
View on Commander Spellbook ↗
Karn, Legacy ReforgedStrionic ResonatorClock of OmensStaff of DominationBasalt Monolith
Infinite colorless mana that can't be spent to cast nonartifact spells; Infinite mana artifacts you control can produce; Infinite untap of artifacts you control; Infinite colorless mana; Infinite lifegain triggers; Infinite lifegain; Infinite card draw; Infinite untap of creatures you control; Infinite draw triggers; Infinite mana creatures you control can produce
View on Commander Spellbook ↗
Karn, Legacy ReforgedLithoform EngineClock of OmensBasalt MonolithGrim Monolith
Infinite colorless mana that can't be spent to cast nonartifact spells; Infinite mana artifacts you control can produce; Infinite untap of artifacts you control; Infinite colorless mana
View on Commander Spellbook ↗
Karn, Legacy ReforgedKarn, Silver GolemLithoform EngineVoltaic Construct
Infinite colorless mana that can't be spent to cast nonartifact spells; Infinite untap of artifact creatures you control
View on Commander Spellbook ↗Price Context
Current price
unknown tier
Current pricing data for Karn, Legacy Reforged isn't available in this snapshot, so check Scryfall or TCGPlayer for the live figure before buying. Given his status as a legendary mythic with genuine combo potential in Commander artifact decks, he typically sits in the mid-range mythic tier — worth verifying whether a reprint has shifted that before pulling the trigger.
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Sources
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.