Karn, Legacy Reforged
March of the Machine: The Aftermath · #49 · Mythic
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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.
*/*
Card details
- Shown printing
- March of the Machine: The Aftermath (MAT)
- Artist
- Grzegorz Rutkowski
- Color identity
- Colorless
- Colors
- Colorless
- Mana value
- 5
- First released
- May 12, 2023
- Printings
- 5
- EDHREC rank
- #2527 on EDHREC
- Market price
- $18.98 (cheapest printing, updated weekly)
Legality
- StandardNot legal
- PioneerLegal
- ModernLegal
- LegacyLegal
- VintageLegal
- CommanderLegal
- PauperNot legal
- BrawlLegal
- Standard BrawlNot legal
- HistoricLegal
- TimelessLegal
- AlchemyNot legal
- GladiatorLegal
- OathbreakerLegal
- Pauper CommanderNot legal
- Duel CommanderLegal
- PreDHNot legal
- PremodernNot legal
- Old SchoolNot legal
- Penny DreadfulLegal
- FutureNot legal
Rulings (3)
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.
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.
All printings
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Card data and images from Scryfall.