30 cards where the cards can’t be your commander and the text includes “command zone”

Campfire (Commander Masters #374)
Cloudkill (Commander Legends: Battle for Baldur's Gate #121)
Command Beacon (Outlaws of Thunder Junction Commander #279)
Commander's Insight (Commander 2021 #23)
Commander's Insignia (Commander 2019 #2)
Echo Storm (March of the Machine Commander #221)
Empyrial Storm (Commander 2018 #2)
Font of Magic (Commander Legends: Battle for Baldur's Gate #71)
Fury Storm (Commander 2018 #22)
Genesis Storm (Commander 2018 #30)
Geode Golem (Commander Masters #386)
Hellkite Courser (Commander Legends #183)
Imposing Grandeur (Crimson Vow Commander #24)
Leadership Vacuum (Commander 2019 #9)
Majestic Genesis (Commander Legends: Battle for Baldur's Gate #240)
Myth Unbound (Commander 2018 #32)
Netherborn Altar (Commander 2020 #45)
Next of Kin (New Capenna Commander #62)
Opal Palace (Commander Masters #422)
Road of Return (Commander 2019 #34)
Skull Storm (Commander 2018 #18)
Stinging Study (Commander 2021 #44)
Study Hall (Commander 2021 #80)
Thunderclap Drake (Outlaws of Thunder Junction Commander #17)
Visions of Dominance (Midnight Hunt Commander #37)
Visions of Dread (Midnight Hunt Commander #34)
Visions of Duplicity (Midnight Hunt Commander #33)
Visions of Glory (Midnight Hunt Commander #32)
Visions of Ruin (Midnight Hunt Commander #36)
Worldknit (Conspiracy #13)

The message was clear to Sorin—time to search for something else.