In this case, its because that mana can only be spent to cast artifact
If they're twice as thick as a regular card, it would pretty much be a nonstarter if you planned to mix them with your other cards (like lands)
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Group Hug Howling Mine | Illustration by Ralph Horsley Commander (1) Creature (22) Veteran Explorer Humble Defector Hushwing Gryff Chasm Skulker Gwafa Hazid, Profiteer Selvala, Explorer Returned Edric, Spymaster of Trest Ludevic, Necro-Alchemist Orzhov Advokist Akroan Horse Selfless Squire Sidar Kondo of Jamuraa Windborn Muse Horizon Chimera Zedruu the Greathearted Kraum, Ludevic's Opus Psychosis Crawler Kazuul, Tyrant of the Cliffs Realm Seekers Rubblehulk Progenitor Mimic Blazing Archon Instant (9) Swords to Plowshares Swan Song Arcane Denial Benefactor's Draught Oblation Beast Within Entrapment Maneuver Reins of Power Sylvan Reclamation Sorcery (11) Minds Aglow Collective Voyage Cultivate Kodama's Reach Tempt with Discovery Migratory Route Wave of Reckoning Seeds of Renewal Treacherous Terrain Reverse the Sands Blasphemous Act Enchantment (8) Evolutionary Escalation Oath of Druids Ghostly Prison Propaganda Rites of Flourishing Sphere of Safety Lurking Predators Hoofprints of the Stag Artifact (9) Sol Ring Empyrial Plate Howling Mine Commander's Sphere Temple Bell Assault Suit Prismatic Geoscope Venser's Journal Keening Stone Land (40) Azorius Chancery Ash Barrens Command Tower Evolving Wilds Exotic Orchard Forbidden Orchard Frontier Bivouac Gruul Turf Homeward Path Izzet Boilerworks Jungle Shrine Krosan Verge Myriad Landscape Mystic Monastery Opal Palace Rupture Spire Seaside Citadel Selesnya Sanctuary Terramorphic Expanse Transguild Promenade Plains x5 Island x5 Mountain x5 Forest x5 Group Hug players just want everyone to have a good time
If you manage to pull one it will say Floodborn on it, but in reality it should say Dreamborn
