If a substitute card enters a public zone (the battlefield, the graveyard, the stack, or exile unless it's exiled face down), use the actual double-faced card and set the substitute card aside
The creature loses all other creature types, but it retains its abilities

The Mixture Kitt Kanto Double Strikers View on Archidekt Commander (1) 1 *Kitt Kanto, Mayhem Diva*Kitt Kanto, Mayhem Diva Creature (28) 1 *Avacyn's Pilgrim*Avacyn's Pilgrim 1 *Birds of Paradise*Birds of Paradise 1 *Boreal Druid*Boreal Druid 1 *Elvish Mystic*Elvish Mystic 1 *Fyndhorn Elves*Fyndhorn Elves 1 *Llanowar Elves*Llanowar Elves 1 *Adorned Pouncer*Adorned Pouncer 1 *Boros Swiftblade*Boros Swiftblade 1 *Fencing Ace*Fencing Ace 1 *Illuminator Virtuoso*Illuminator Virtuoso 1 *Kor Blademaster*Kor Blademaster 1 *Lizard Blades*Lizard Blades 1 *Swiftblade Vindicator*Swiftblade Vindicator 1 *Twinblade Geist*Twinblade Geist 1 *Aven Sunstriker*Aven Sunstriker 1 *Blade-Blizzard Kitsune*Blade-Blizzard Kitsune 1 *Fabled Hero*Fabled Hero 1 *Markov Blademaster*Markov Blademaster 1 *Mavinda, Students' Advocate*Mavinda, Students' Advocate 1 *Mirran Crusader*Mirran Crusader 1 *Prophetic Flamespeaker*Prophetic Flamespeaker 1 *Siege Striker*Siege Striker 1 *Skyhunter Skirmisher*Skyhunter Skirmisher 1 *Solemn Recruit*Solemn Recruit 1 *Drizzt Do'Urden*Drizzt Do'Urden 1 *Fury*Fury 1 *God-Eternal Oketra*God-Eternal Oketra 1 *Samut, Voice of Dissent*Samut, Voice of Dissent Instant (20) 1 *Ajani's Presence*Ajani's Presence 1 *Brute Force*Brute Force 1 *Built to Smash*Built to Smash 1 *Expedite*Expedite 1 *Fervent Strike*Fervent Strike 1 *Infuriate*Infuriate 1 *Nature's Claim*Nature's Claim 1 *Path to Exile*Path to Exile 1 *Samut's Spint*Samut's Spint 1 *Swords to Plowshares*Swords to Plowshares 1 *Titan's Strength*Titan's Strength 1 *Vastwod Fortification*Vastwod Fortification 1 *Fists of Flame*Fists of Flame 1 *Heroic Intervention*Heroic Intervention 1 *Invigorated Rampage*Invigorated Rampage 1 *Sejiri Shelter*Sejiri Shelter 1 *Valorous Stance*Valorous Stance 1 *Chaos Warp*Chaos Warp 1 *Invigorate*Invigorate 1 *Valakut Awakening*Valakut Awakening Artifact (1) 1 *Sol Ring*Sol Ring Enchantment (8) 1 *Hyena Umbra*Hyena Umbra 1 *Rancor*Rancor 1 *Spider Umbra*Spider Umbra 1 *Angelic Gift*Angelic Gift 1 *Goblin Orinflamme*Goblin Orinflamme 1 *Madcap Skills*Madcap Skills 1 *Rhythm of the Wild*Rhythm of the Wild 1 *Marshal's Anthem*Marshal's Anthem Sorcery (13) 1 *Ancestral Anger*Ancestral Anger 1 *Crash Through*Crash Through 1 *Maximize Velocity*Maximize Velocity 1 *Reckless Charge*Reckless Charge 1 *Scale Up*Scale Up 1 *Shatterskull Smashing*Shatterskull Smashing 1 *Bala Ged Recovery*Bala Ged Recovery 1 *Harvest Season*Harvest Season 1 *Makindi Stampede*Makindi Stampede 1 *Emeria's Call*Emeria's Call 1 *Turntimber Symbiosis*Turntimber Symbiosis 1 *Vanquish The Horde*Vanquish The Horde 1 *Blasphemous Act*Blasphemous Act Land (29) 1 *Battlefield Forge*Battlefield Forge 1 *Bountiful Promenade*Bountiful Promenade 1 *Brushland*Brushland 1 *City of Brass*City of Brass 1 *Command Tower*Command Tower 1 *Exotic Orchard*Exotic Orchard 1 *Handweir Battlements*Handweir Battlements 1 *Horizon Canopy*Horizon Canopy 1 *Jetmir's Garden*Jetmir's Garden 1 *Karplusan Forest*Karplusan Forest 1 *Mana Confluence*Mana Confluence 1 *Prismatic Vista*Prismatic Vista 1 *Sacred Foundry*Sacred Foundry 1 *Slayers' Stronghold*Slayers' Stronghold 1 *Spectator Seating*Spectator Seating 1 *Spire Garden*Spire Garden 1 *Stomping Ground*Stomping Ground 1 *Sunbaked Canyon*Sunbaked Canyon 1 *Temple Garden*Temple Garden 4 ForestForest 2 MountainMountain 4 PlainsPlains Our mana ramp suite is mainly mana dorks

Someone else might spend the card instead and leave you ahead in card advantage
Check out the image below for an example of where to find this symbol on a card
Each plane is a unique world, with its own history and culture, its own distinct ecosystems and recognizable landscape