Metagame concentration
How few decks Legacy is, month by month, against every ban on record. Each point is the chance that two decks drawn at random from that month's field are the same archetype (the Herfindahl–Hirschman index), shown as the number of decks a field that concentrated is equivalent to. How this is calculated
Lower means more concentrated. Months pooling fewer than 200 classified decks, or fewer than two events, are left blank rather than plotted — below that the reading moves more with how much data the month held than with the format. Decks the classifier could not name are excluded; each point's tooltip reports what share of the field that left.
Tier history — top archetypes
The 8 biggest archetypes by meta share, on one axis. Each line is the score its tier is computed from, so a ban or a set release shows up as the whole field rearranging.
The Y axis is the score each archetype's tier is computed from: for measured points a 60/40 blend of MTGGoldfish meta share and TopDeck top-8 appearances, for reconstructed ones the meta share our classifier derives from standings. Dashed horizontal lines mark the tier thresholds.
The shaded span left of the dashed vertical line is reconstructed from historical standings (issue #214), not measured at the time; those segments are drawn dashed, and they break rather than join at the changeover because no single reading bridges the two. The two eras are scored against different denominators — a reconstructed share is a slice of our classifier's archetypes, a measured one a slice of MTGGoldfish's curated list — so compare shapes across the line, not values. D tier is reconstructed-only — the live writer floors at C — so a line can step D→C at the changeover without its score moving.
Deck costs estimate an average list at each card's cheapest printing across all printings, promos and reprints included.
S-Tier
Meta-defining archetypes (≥10% meta share) (1 archetypes)
A-Tier
Competitive tier archetypes (5-10% meta share) (8 archetypes)
B-Tier
Viable archetypes (2-5% meta share) (11 archetypes)

Boros Energy

Death and Taxes (Yorion) - Black/White

Tron

Jeskai Control

Dimir Control

Rakdos Reanimator

Mardu Energy

The EPIC Storm

Omni-Tell

Oops! All Spells

Red Stompy
C-Tier
Low-meta archetypes (1-2% meta share) (39 archetypes)

LED Dredge

Aluren

Elves

Sewer-Cam Combo

Azorius Tempo

Naya Initiative

Selesnya Depths

Death and Taxes (Yorion) - Mono White

Creative Technique

Beseech Storm

Painter

Affinity Stompy

Saga Storm

Sultai Depths

Jeskai Tempo

Esper Control

Hogaak Moonshadow

Nic Fit

Goblins

Jund

Green Cloudpost

Blue Artifacts

Merfolk

Helm/Leyline Stompy

Beanstalk Control (Yorion)

Cradle Control

Reanimator

Necrodominance Combo

Mono Black Midrange

Cephalid Breakfast

Beanstalk Control (Non-Yorion)

Azorius Control

Stiflenought

Burn

The EPIC Gamble

Mono-White Initiative

Loam Pox

Ninjas







