Metagame concentration
How few decks Premodern 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) (2 archetypes)
B-Tier
Viable archetypes (2-5% meta share) (11 archetypes)

Simic Stiflenought

Mono-Black Midrange

5c Hermit Druid

Selesnya Land Destruction

Psychatog

The Rock

Azorius Replenish

Orzhov Control

Gruul Goblins

Elves

Azorius Stiflenought
C-Tier
Low-meta archetypes (1-2% meta share) (43 archetypes)

Mono-Blue

Mono-Red Sligh

Gro-A-Tog

Gruul Sligh

5c Stiflenought

Mono W Control

Reanimator

Golgari

4c Terragedon

BWG Control

Mono-White

Abzan Terragedon

Zombies

Gruul Survival Welder

Iggy Pop

4c Aluren

Selesnya

4c Recurring Survival

Bant Terragedon

4c Ponza

Bant Enchantress

Mono-Red Land Destruction

Mono-Red Goblins

Deadguy Ale

Rakdos Midrange

Gruul Land Destruction

Izzet

5c Aluren

Temur Stiflenought

Tinkernought

Mono-Black

Rakdos Goblins

Dimir Stiflenought

Temur Madness

W-B-R-G

4c Stiflenought

Orzhov

W-U-B-G

Boros Goblins

5c Terragedon

Esper Stiflenought

Sultai Aluren


