Fellwar Stone

Public decks that run Fellwar Stone

• Animated Army - Bloomburrow Commander, led by Bello, Bard of the Brambles
• Arcane Wizardry - Commander 2017, led by Inalla, Archmage Ritualist
• Avengers Assemble - Marvel Super Heroes, led by Captain America, Team Leader
• Bedecked Brokers - New Capenna Commander, led by Perrie, the Pulverizer
• Blame Game - Murders at Karlov Manor Commander, led by Nelly Borca, Impulsive Accuser
• Breed Lethality - Commander 2016, led by Atraxa, Praetors' Voice
• Breed Lethality - Commander Anthology Volume II, led by Atraxa, Praetors' Voice
• Buckle Up - Neon Dynasty Commander, led by Kotori, Pilot Prodigy
• Cabaretti Cacophony - New Capenna Commander, led by Kitt Kanto, Mayhem Diva
• Cavalry Charge - March of the Machine Commander, led by Sidar Jabari of Zhalfir
• Corrupting Influence - Phyrexia: All Will Be One Commander, led by Ixhel, Scion of Atraxa
• Dance of the Elements - Lorwyn Eclipsed Commander Deck, led by Ashling, the Limitless
• Draconic Dissent - Commander Legends: Battle for Baldur's Gate, led by Firkraag, Cunning Instigator
• Dungeons of Death - Forgotten Realms Commander, led by Sefris of the Hidden Ways
• Endless Punishment - Duskmourn: House of Horror Commander, led by Valgavoth, Harrower of Souls
• Entropic Uprising - Commander 2016, led by Yidris, Maelstrom Wielder
• Fae Dominion - Wilds of Eldraine Commander, led by Tegwyll, Duke of Splendor
• Family Matters - Bloomburrow Commander, led by Zinnia, Valley's Voice
• From Cute to Brute - Secret Lair Drop, led by Esika, God of the Tree // The Prismatic Bridge
• Grand Larceny - Outlaws of Thunder Junction Commander, led by Gonti, Canny Acquisitor
• Invent Superiority - Commander 2016, led by Breya, Etherium Shaper
• Jeskai Striker - Tarkir: Dragonstorm Commander, led by Shiko and Narset, Unified
• Legends' Legacy - Dominaria United, led by Dihada, Binder of Wills
• Lorehold Spirit - Secrets of Strixhaven, led by Quintorius, History Chaser

The first 24 of 43, by name.

Commanders that run Fellwar Stone most

Deck counts from EDHREC.

• Valgavoth, Harrower of Souls: 18,477 decks
• Kefka, Court Mage // Kefka, Ruler of Ruin: 17,994 decks
• The Ur-Dragon: 17,389 decks
• Ashling, the Limitless: 17,133 decks
• Kinnan, Bonder Prodigy: 16,874 decks
• Ms. Bumbleflower: 16,660 decks
• Kaalia of the Vast: 15,051 decks
• Y'shtola, Night's Blessed: 14,558 decks

Often played with Fellwar Stone

Cards that show up in the same decks on EDHREC.

• Elemental Spectacle
• Jubilation
• Cavalier of Thorns
• Vernal Sovereign
• Greenwarden of Murasa
• Avengers Quinjet
• Metamorphosis
• Hatchery Sliver
• Foratog
• Quick Sliver

Rulings

• 2004-10-04: It only produces one mana even if the land can produce more than one.
• 2004-10-04: This works even if the opponent's lands are tapped. It only checks what kinds of mana can be produced, not if the abilities that produce them are usable right now.
• 2004-10-04: The ability can be activated if the opponent has no lands that produce mana, but the effect will not be able to generate any mana.
• 2009-10-01: Fellwar Stone doesn't care about any restrictions or riders your opponents' lands (such as Ancient Ziggurat or Hall of the Bandit Lord) put on the mana they produce. It just cares about colors of mana.
• 2009-10-01: When determining what colors of mana your opponents' lands could produce, take into account any applicable replacement effects that would apply to those lands' mana abilities (such as Contamination's effect, for example). If there is more than one, consider them in any possible order.
• 2009-10-01: Fellwar Stone checks the effects of all mana-producing abilities of lands your opponents control, but it doesn't check their costs. For example, Vivid Crag has the ability "{T}, Remove a charge counter from Vivid Crag: Add one mana of any color." If an opponent controls Vivid Crag and you control Fellwar Stone, you can tap Fellwar Stone for any color of mana. It doesn't matter whether Vivid Crag has a charge counter on it, and it doesn't matter whether it's untapped.
• 2009-10-01: The colors of mana are white, blue, black, red, and green. Fellwar Stone can't be tapped for colorless mana, even if a land an opponent controls could produce colorless mana.