Swarm Intelligence

Public decks that run Swarm Intelligence

• Arcane Maelstrom - Commander 2020, led by Kalamax, the Stormsire
• Prismari Performance - Commander 2021, led by Zaffai, Thunder Conductor

Commanders that run Swarm Intelligence most

Deck counts from EDHREC.

• Kalamax, the Stormsire: 2,284 decks
• Neera, Wild Mage: 1,837 decks
• Veyran, Voice of Duality: 1,520 decks
• Narset, Enlightened Master: 1,118 decks
• Zethi, Arcane Blademaster: 903 decks
• Ashling, Rekindled // Ashling, Rimebound: 903 decks
• Eluge, the Shoreless Sea: 849 decks
• Zaffai, Thunder Conductor: 763 decks

Often played with Swarm Intelligence

Cards that show up in the same decks on EDHREC.

• Slice in Twain
• Tribute to the Wild
• Wort, the Raidmother
• Hunting Pack
• Natural Connection
• Muse Vortex
• Glademuse
• Curious Herd
• Mirari
• Show of Confidence

Rulings

• 2017-07-14: If the spell has damage divided as it was cast (like Chandra’s Pyrohelix), the division can’t be changed (although the targets receiving that damage still can).
• 2017-07-14: If the spell that’s copied has an X whose value was determined as it was cast (like Torment of Hailfire does), the copy will have the same value of X.
• 2017-07-14: If the spell that’s copied is modal (that is, it says “Choose one —” or the like), the copy will have the same mode. A different mode can’t be chosen.
• 2017-07-14: Swarm Intelligence can copy any instant or sorcery spell, not just one with targets.
• 2017-07-14: Swarm Intelligence can copy the spell even if it’s countered before Swarm Intelligence’s triggered ability resolves.
• 2017-07-14: The copy is created on the stack, so it’s not “cast.” Abilities that trigger when a player casts a spell (such as Swarm Intelligence’s own ability) won’t trigger.
• 2017-07-14: The controller of a copy can’t choose to pay any alternative or additional costs for the copy. However, effects based on any alternative or additional costs that were paid for the original spell are copied as though those same costs were paid for the copy.
• 2017-07-14: The copy will have the same targets as the spell it’s copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. If, for one of the targets, you can’t choose a new legal target, then it remains unchanged (even if the current target is illegal).