MagicTheGathering.fyi

Swarm Intelligence

Enchantment

Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy.

CMC
7
Mana cost
{6}{U}
Color identity
U
Rarity
rare
Set
Hour of Devastation
Price
$0.35
EDHREC rank
#4404
Buy on TCGplayer
Swarm Intelligence card art
Swarm Intelligence copies every instant and sorcery you cast for the rest of the game — the effect is backbreaking, and the cost is seven mana with no immediate impact. The ceiling is absurd in spell-heavy decks where Narset's Reversal or any cantrip becomes a free double-dip, but seven mana for a do-nothing enchantment means it's dead weight if you can't protect it or follow up immediately with Neera, Wild Mage-style volume.

Best Commanders

Commanders with the highest synergy

01
Neera, Wild Mage

Neera, Wild Mage

36.0% of decks · synergy 0.33

Neera, Wild Mage randomly casts spells for free, and Swarm Intelligence ensures every one of those free casts fires twice — the combo of randomness and doubling produces a cascading advantage that's nearly impossible to contain.

02
Kalamax, the Stormsire

Kalamax, the Stormsire

27.1% of decks · synergy 0.26

Kalamax, the Stormsire already copies the first instant you cast each turn, so Swarm Intelligence stacks a second copy on top, turning every combat-step counterspell or pump spell into a triple-trigger threat that also grows Kalamax unbounded.

03
Narset, Enlightened Master

Narset, Enlightened Master

18.4% of decks · synergy 0.18

Narset, Enlightened Master's attack trigger exiles instants and sorceries and casts them for free, so Swarm Intelligence converts every free cast into two — each swing through an open board becomes a potential two-for-one spell storm with no additional mana investment.

04
Zethi, Arcane Blademaster

Zethi, Arcane Blademaster

14.8% of decks · synergy 0.14

Zethi, Arcane Blademaster imprints instants onto swords and recasts them on attack, so Swarm Intelligence doubles every imprinted recurrence, effectively halving the cost of maintaining multiple sword-installed spell loops.

05
Veyran, Voice of Duality

Veyran, Voice of Duality

15.5% of decks · synergy 0.12

Veyran, Voice of Duality already rewards you for stacking magecraft triggers, and Swarm Intelligence doubles the spell count on each cast, feeding Veyran's doubling of those triggers and creating an exponential payoff for any spell-heavy turn.

Format Analysis

Where it lives, where it can’t

FormatVerdict
commander legal
legacy legal
modern legal
pioneer legal
standard not legal
vintage legal
pauper not legal
oathbreaker legal

Swarm Intelligence is legal in Commander, Legacy, Modern, Pioneer, Vintage, and Oathbreaker, but it's essentially a Commander card in practice. Seven mana is a non-starter in Legacy, Modern, and Vintage, where games end before you untap with it, and Pioneer's tempo demands are only marginally more forgiving. In Commander, the multiplayer clock is slow enough to justify the cost, and a resolved Swarm Intelligence in a spell-heavy deck can single-handedly close out a game over the following two or three turns. Oathbreaker is the one non-Commander format where it occasionally sees play, since planeswalker-based strategies can generate enough value to justify the slot.

Key Combos

Combo lines featuring this card

Price Context

Current price

$0.35 bulk tier

At $0.35, Swarm Intelligence is bulk, which is accurate for a seven-mana enchantment with no competitive demand outside Commander. The price is stable — high-end spell decks want it, but the supply from its print runs far outpaces that niche audience, so don't expect it to move.

Explore

Sources

Mentioned

← All cards

Updated . Data from Scryfall, EDHREC, and Commander Spellbook.