27 cards where the set is “mom” and the text includes “convoke”

Aerial Boost (March of the Machine #2)
Cut Short (March of the Machine #10)
Knight-Errant of Eos (March of the Machine #26)
Artistic Refusal (March of the Machine #46)
Astral Wingspan (March of the Machine #48)
Complete the Circuit (March of the Machine #52)
Interdisciplinary Mascot (March of the Machine #326)
Invasion of Segovia // Caetus, Sea Tyrant of Segovia (March of the Machine #63)
Invasion of Segovia // Caetus, Sea Tyrant of Segovia (March of the Machine #63)
Meeting of Minds (March of the Machine #66)
Referee Squad (March of the Machine #327)
Temporal Cleansing (March of the Machine #80)
Thunderhead Squadron (March of the Machine #81)
Transcendent Message (March of the Machine #83)
Wicked Slumber (March of the Machine #84)
Zephyr Singer (March of the Machine #86)
Collective Nightmare (March of the Machine #95)
Hoarding Broodlord (March of the Machine #110)
Pile On (March of the Machine #122)
Burning Sun's Fury (March of the Machine #133)
City on Fire (March of the Machine #135)
Ramosian Greatsword (March of the Machine #159)
Shatter the Source (March of the Machine #164)
Shivan Branch-Burner (March of the Machine #165)
Stoke the Flames (March of the Machine #166)
Ancient Imperiosaur (March of the Machine #174)
Joyful Stormsculptor (March of the Machine #243)
Halo Hopper (March of the Machine #260)

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