30 cards where the set is “clu” and the collector number >= 22 and the collector number <= 51

Aegis of the Legion (Ravnica: Clue Edition #22)
Afterlife Insurance (Ravnica: Clue Edition #23)
Amzu, Swarm's Hunger (Ravnica: Clue Edition #24)
Boros Strike-Captain (Ravnica: Clue Edition #25)
Carnage Interpreter (Ravnica: Clue Edition #26)
Conclave Evangelist (Ravnica: Clue Edition #27)
Corporeal Projection (Ravnica: Clue Edition #28)
Covetous Elegy (Ravnica: Clue Edition #29)
Dimir Strandcatcher (Ravnica: Clue Edition #30)
Ecstatic Electromancer (Ravnica: Clue Edition #31)
Frenzied Gorespawn (Ravnica: Clue Edition #32)
Furious Spinesplitter (Ravnica: Clue Edition #33)
Herald of Ilharg (Ravnica: Clue Edition #34)
Incriminating Impetus (Ravnica: Clue Edition #35)
Lavinia, Foil to Conspiracy (Ravnica: Clue Edition #36)
Lonis, Genetics Expert (Ravnica: Clue Edition #37)
Memory Vampire (Ravnica: Clue Edition #38)
Ordruun Mentor (Ravnica: Clue Edition #39)
Portal Manipulator (Ravnica: Clue Edition #40)
Resonance Technician (Ravnica: Clue Edition #41)
Scuttling Sentinel (Ravnica: Clue Edition #42)
Sludge Titan (Ravnica: Clue Edition #43)
Stampede Surfer (Ravnica: Clue Edition #44)
Sumala Rumblers (Ravnica: Clue Edition #45)
Suppressor Skyguard (Ravnica: Clue Edition #46)
Syndicate Heavy (Ravnica: Clue Edition #47)
Tribune of Rot (Ravnica: Clue Edition #48)
Undercover Butler (Ravnica: Clue Edition #49)
Unruly Krasis (Ravnica: Clue Edition #50)
Vernal Sovereign (Ravnica: Clue Edition #51)

Though this query has ended, its relics still slumber in New Argive.