Perhaps that's partly the reason - doubtless some canny collectors picked up copies and stand to profit now everyone else is jumping on the bandwagon
Activate only as a sorcery.) Tap: Exile target card from a graveyard
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Triumph of Saint Katherine Skullclamp Everflowing Chalice Utter End Reconnaissance Mission Swords to Plowshares Martial Coup Launch the Fleet Hour of Reckoning Entrapment Maneuver Deploy to the Front Bastion Protector Collective Effort Neyam Shai Murad Inquisitor Eisenhorn Skycloud Expanse Scoured Barrens Prairie Stream Tranquil Cove Port Town Memorial to Glory Darkwater Catacombs Arcane Sanctum Sister Hospitaller Ash Barrens Belisarius Cawl Mortify Callidus Assassin Birth of the Imperium Celestine, the Living Saint Exterminatus Defenders of Humanity The Golden Throne Go for the Throat Beacon of Unrest Hedron Archive Mask of Memory Sculpting Steel Unstable Obelisk And They Shall Know No Fear Swamp Commissar Severina Raine Zephyrim Polluted Mire Myriad Landscape Desert of the Glorified Talisman of Progress Overgrowth Harrow Sanguinary Priest Thought Vessel Mutilate Gilded Lotus Endless Atlas Mystic Forge Caged Sun Living Death Darkness Triarch Stalker Triarch Praetorian Tomb Fortress Tomb Blade Their Name is Death The War in Heaven Technomancer Skorpekh Lord Skorpekh Destroyer Shard of the Void Dragon Sceptre of Eternal Glory Sautekh Immortal Royal Warden Resurrection Orb Plasmancer Night Scythe Necron Overlord Necron Monolith

There are two cards that specifically reference the card Murder the Butler that murders people, and the Auren Express, a very clear reference to the Murder on the Orient Express
BPhillipYork: Weird sort of card since generally you want to mill creatures, but there are scenarios like where you have a way to play lands from your graveyard where this would help you choose what goes into your hand and then just play the lands from your yard