Heralds Horn lets you pick a creature type when it comes into play, granting a static reduction of one generic mana to their casting cost

Agent 13, Sharon Carter Alquist Proft, Master Sleuth Angelic Sleuth Antarctic Research Base Antique Collector April O'Neil, Live on the Scene Armed with Proof Auspicious Arrival Ballroom Bearer of Overwhelming Truths Billiard Room Briarbridge Patrol Briarbridge Tracker Bygone Bishop Byway Courier Carnage Interpreter Case of the Filched Falcon Chalk Outline Cold Case Cracker Confirm Suspicions Confront the Unknown Conservatory Curious Inquiry Declaration in Stone Deduce Dennick, Pious Apparition Detective's Satchel Dining Room Disorder in the Court Drag the Canal Drownyard Explorers Duggan, Private Detective Eliminate the Impossible Eloise, Nephalia Sleuth Erdwal Illuminator Ethereal Investigator Evidence Examiner Expose Evil Ezrim, Agency Chief Fleeting Memories Floodhound Flotsam // Jetsam Flotsam // Jetsam Follow the Bodies Foreboding Steamboat Forensic Gadgeteer Foul Play Fugitive of the Judoon Funnel-Web Recluse Gleaming Geardrake Gone Missing Hall Hard Evidence Heaven Sent Hold for Questioning Homicide Investigator Hostile Investigator Hotshot Investigators Humble the Brute Innocent Bystander Innocuous Researcher Inquisitor Eisenhorn Inquisitor Greyfax Jace's Scrutiny James, Wandering Dad James, Wandering Dad Kellan, Inquisitive Prodigy Kellan, Inquisitive Prodigy Kitchen Lavinia, Foil to Conspiracy Lazav, Wearer of Faces Library
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This doesn't mean Stage Ones are bad cards, many are amazing, but them being slower cards to get into play is something a player should consider when deckbuilding
Put the rest on the bottom in a random order.) You can cast Daring Discovery with no targets and just discover 4
One black: You can sacrifice a creature to make all players sacrifice Two generic, one red: You sacrifice an artifact to make all players sacrifice an artifact