30 cards where (the set is “dis” or the set is “gpt” or the set is “rav”) and the cards have hybrid mana

Avatar of Discord (Dissension #140)
Azorius Guildmage (Dissension #141)
Biomantic Mastery (Dissension #142)
Boros Guildmage (Ravnica: City of Guilds #242)
Boros Recruit (Ravnica: City of Guilds #243)
Centaur Safeguard (Ravnica: City of Guilds #244)
Debtors' Knell (Guildpact #141)
Dimir Guildmage (Ravnica: City of Guilds #245)
Djinn Illuminatus (Guildpact #142)
Dovescape (Dissension #143)
Gaze of the Gorgon (Ravnica: City of Guilds #246)
Giant Solifuge (Guildpact #143)
Gleancrawler (Ravnica: City of Guilds #247)
Golgari Guildmage (Ravnica: City of Guilds #248)
Gruul Guildmage (Guildpact #144)
Izzet Guildmage (Guildpact #145)
Lurking Informant (Ravnica: City of Guilds #249)
Master Warcraft (Ravnica: City of Guilds #250)
Minister of Impediments (Dissension #144)
Mourning Thrull (Guildpact #146)
Orzhov Guildmage (Guildpact #147)
Petrahydrox (Guildpact #148)
Privileged Position (Ravnica: City of Guilds #251)
Rakdos Guildmage (Dissension #145)
Riot Spikes (Dissension #146)
Selesnya Guildmage (Ravnica: City of Guilds #252)
Shadow of Doubt (Ravnica: City of Guilds #253)
Shielding Plax (Dissension #147)
Simic Guildmage (Dissension #148)
Wild Cantor (Guildpact #149)

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