25 cards where the text matches the regex /^.{200,}/ and the set is “mkm”

Relive the Past (Murders at Karlov Manor #226)
Niv-Mizzet, Guildpact (Murders at Karlov Manor #220)
Kylox's Voltstrider (Murders at Karlov Manor #215)
Kylox, Visionary Inventor (Murders at Karlov Manor #214)
Kaya, Spirits' Justice (Murders at Karlov Manor #211)
Break Out (Murders at Karlov Manor #190)
Blood Spatter Analysis (Murders at Karlov Manor #189)
Slime Against Humanity (Murders at Karlov Manor #177)
Sharp-Eyed Rookie (Murders at Karlov Manor #176)
The Pride of Hull Clade (Murders at Karlov Manor #172)
A Killer Among Us (Murders at Karlov Manor #167)
Hedge Whisperer (Murders at Karlov Manor #165)
Krenko's Buzzcrusher (Murders at Karlov Manor #136)
Incinerator of the Guilty (Murders at Karlov Manor #132)
Frantic Scapegoat (Murders at Karlov Manor #126)
Anzrag's Rampage (Murders at Karlov Manor #111)
Outrageous Robbery (Murders at Karlov Manor #97)
Deadly Cover-Up (Murders at Karlov Manor #83)
Proft's Eidetic Memory (Murders at Karlov Manor #67)
Intrude on the Mind (Murders at Karlov Manor #61)
Behind the Mask (Murders at Karlov Manor #39)
Agency Outfitter (Murders at Karlov Manor #38)
Unyielding Gatekeeper (Murders at Karlov Manor #35)
Tenth District Hero (Murders at Karlov Manor #34)
Case File Auditor (Murders at Karlov Manor #7)

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