Consulting the ledger
The record
Every ban and set release that moved the format. These mark the boundaries between metagames — read any window against the change that opened it.
Edge of Eternities released
Final Fantasy released
Tarkir: Dragonstorm released
Aetherdrift released
Jegantha the Wellspring BANNED
Duskmourn: House of Horror released
Amalia Benavides Aguirre BANNED, Sorin Imperious Bloodlord BANNED
Bloomburrow released
Outlaws of Thunder Junction released
Murders at Karlov Manor released
Karn the Great Creator BANNED, Geological Appraiser BANNED, Smuggler's Copter UNBANNED
The Lost Caverns of Ixalan released
Wilds of Eldraine released