Metagame concentration
How few decks Modern 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.
A-Tier
Competitive tier archetypes (5-10% meta share) (4 archetypes)
B-Tier
Viable archetypes (2-5% meta share) (12 archetypes)

Rakdos Midrange

Devoted Combo

Jeskai Prowess

Eldrazi

Goryo's Vengeance

Amulet Titan

Living End

Tron

Eldrazi Tron

Boros Energy

Belcher

Eldrazi Ramp
C-Tier
Low-meta archetypes (1-2% meta share) (43 archetypes)

Izzet Murktide

Neobrand

Rakdos Aggro

Indomitable Creativity

Grixis Control

Grixis Reanimator

Mono-Green Eldrazi

Azorius Control

Mono-Black Midrange

Boros Burn

4c HollowOne

Sam Combo

Temur Prowess

4c Midrange

Titan Shift

Dimir Midrange

The Rock

Mill

Through the Breach

Hammer Time

Death's Shadow

Izzet Prowess

Esper Reanimator

Yawgmoth

Boros Ponza

Esper Midrange

Gruul Basking Broodscale Combo

Azorius Energy

Rakdos HollowOne

Grixis Midrange

Sultai Midrange

Mono-Red Burn

Mardu Energy

Esper Blink

Merfolk

Izzet Steel-Cutter

Jeskai Energy

Dimir Murktide

Bant Midrange

Azorius Blink

Song of Creation

Grixis Prowess




