Colors
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Black: Marvel Super Heroes (68 decks), compared with Secrets of Strixhaven (82 decks)

New cards by set

Cards first printed in the set · share of Black decks that can play them

– means fewer than 3 decks. Picked up later: the share clearly rose after the release window (10+ decks, |z| ≥ 3).

Built more

SOS → MSH
▲ Stalactite Stalker 0.0% → 17.6% 0 → 12 decks
▲ Moonshadow 4.9% → 22.1% 4 → 15 decks

Built less

SOS → MSH

No card fell clearly.

Commanders

Share of Black decks · each builder counts once

No commander changed clearly. Closest to a trend:

▲ Braids, Arisen Nightmare 2.4% → 7.4% z = 1.4
▲ Acererak the Archlich 9.8% → 14.7% z = 0.9
▲ Karumonix, the Rat King 4.9% → 7.4% z = 0.6

Shares are out of the decks that can play the card. A change shows when it's clear: 10+ decks on one side and |z| ≥ 3, odds under 1 in 300 by chance. Cards first printed in Marvel Super Heroes are under New cards by set.

Deck shape by window

Per deck, except the deck count and shares

Each builder counts once per commander and set window, with their latest list. A deck counts in the window of its last edit.