The emphasis was on gun all the way through, right down to the art description given by Randy Buehler: "Exhausted Goblin turning the crank on a very primitive looking chain gun
The secondary market value of individual cards is driven by a mix of character popularity, structural rarity, exceptional illustration style, and competitive performance

Advanced Search Sets Random Syntax Abstruse Archaic Academic Probation Arachnus Web Archon of the Triumvirate Arrest Avacyn's Collar, the Symbol of Her Church (playtest) Ayesha Tanaka Azorius Arrester Azorius Guildmage Azorius Justiciar Bind Bind (playtest) Bound in Gold Braided Net Brown Ouphe Clarion Conqueror Collector Ouphe Cursed Totem Damping Matrix Deadlock Trap Demotion Desert's Hold Detainment Spell Detention Vortex Disallow Disruptor Flute Dovin Baan Drana and Linvala Echo, Perceptive Prodigy Edifice of Authority Encrust Faith's Fetters Gelid Shackles Gobsmacked Gogo, Master of Mimicry Hold for Questioning Ice Cage Inaction Injunction Intercessor's Arrest Interdict Isperia's Skywatch Kang the Conqueror Karn, the Great Creator Katabatic Winds Koma, Cosmos Serpent Koma, Cosmos Serpent Krasis Incubation Lavinia of the Tenth Lawmage's Binding Linvala, Keeper of Silence Linvala, Shield of Sea Gate Lost in Thought Lyev Decree Lyev Skyknight Martial Law Mythos of Vadrok Nahiri's Binding New Prahv Guildmage Null Rod One Thousand Lashes Ouphe Vandals Peace Talks Petrified Hamlet Petrify Phyrexian Revoker Pithing Needle Planar Disruption Prison Sentence Prison Term Quagnoth Realmbreaker's Grasp Repudiate // Replicate

The answer is If an effect allows you to play a specific modal double-faced card, you may cast it as a spell or play it as a land, as determined by which face you choose to play