Karn's Bastion

Public decks that run Karn's Bastion

• Bedecked Brokers - New Capenna Commander, led by Perrie, the Pulverizer
• Corrupting Influence - Phyrexia: All Will Be One Commander, led by Ixhel, Scion of Atraxa
• Counter Intelligence - Edge of Eternities Commander Deck, led by Kilo, Apogee Mind
• Explorers of the Deep - The Lost Caverns of Ixalan Commander, led by Hakbal of the Surging Soul
• Growing Threat - March of the Machine Commander, led by Brimaz, Blight of Oreskos
• Planeswalker Party - Commander Masters, led by Commodore Guff

Commanders that run Karn's Bastion most

Deck counts from EDHREC.

• Atraxa, Praetors' Voice: 27,418 decks
• Hakbal of the Surging Soul: 15,465 decks
• Kilo, Apogee Mind: 14,083 decks
• Fynn, the Fangbearer: 9,524 decks
• The Wise Mothman: 8,453 decks
• Auntie Ool, Cursewretch: 6,918 decks
• Tidus, Yuna's Guardian: 6,803 decks
• Brimaz, Blight of Oreskos: 6,765 decks

Often played with Karn's Bastion

Cards that show up in the same decks on EDHREC.

• Chandra, Legacy of Fire
• Jaya's Phoenix
• Phyresis Outbreak
• Scar
• Keral Keep Disciples
• Glistening Sphere
• Bloated Processor
• Hand of the Praetors
• Geth's Summons
• Caress of Phyrexia

Rulings

• 2023-02-04: To proliferate, you can choose any permanent that has a counter, including ones controlled by opponents. You can choose any player who has a counter, including opponents. You can't choose cards in any zone other than the battlefield, even if they have counters on them.
• 2023-02-04: If a permanent ever has both +1/+1 counters and -1/-1 counters on it at the same time, they're removed in pairs as a state-based action so that the permanent has only one of those kinds of counters on it.
• 2023-02-04: Players can respond to a spell or ability whose effect includes proliferating. Once that spell or ability starts to resolve, however, and its controller chooses which permanents and players will get new counters, it's too late for anyone to respond.
• 2023-02-04: An ability that triggers "Whenever you proliferate" triggers even if you chose no permanents or players while doing so.
• 2023-02-04: If a player or permanent has more than one kind of counter on it, and you choose for it to get additional counters, it must get one of each kind of counter it already has. You can't have it get just one kind of counter it already has and not the others.
• 2023-02-04: You don't have to choose every permanent or player that has a counter, only the ones you want to add another counter to. Since "any number" includes zero, you don't have to choose any permanents at all, and you don't have to choose any players at all.