Symbiotic Swarm is a 100-card Commander precon from C20, released April 17, 2020. Its commander is Kathril, Aspect Warper, and its colours are white, black and green. The list runs 34 creatures, 7 sorceries, 7 artifacts, 6 instants, 6 enchantments and 1 planeswalker, with 38 lands.
Out of the box this list reads as Bracket 2, Core, with no Game Changers, 38 lands and an average mana value of 4.2 across the 61 nonland cards of the 99. The bracket is read from the cards alone, with the Game Changers list of February 9, 2026. Official policy also weighs intent and how fast a deck wins, which a decklist cannot show.
Decklist, card data and prices from MTGJSON (card data build of November 13, 2026). Statistics computed November 11, 2026.
The full Symbiotic Swarm list, 100 cards by type. Every card links to its own page with printings, price and format legality.
Product data source: Wizards of the Coast (https://magic.wizards.com/en/articles/archive/news/symbiotic-swarm-2020-04-06)