And getting that wrong is how most beginners lose money as they bury a $40 card inside a bulk lot and watch it leave for six dollars, thinking they made a bag
There isnt one universally published official thickness that covers every era and every print facility, and you can drive yourself nuts trying to make it a single magical number

Creatures (28) 1 Weathered Wayfarer 1 Karmic Guide 1 Boldwyr Intimidator 1 Balefire Liege 1 Knight of the White Orchid 1 Knight-Captain of Eos 1 Kederekt Leviathan 1 Serra Ascendant 1 Sunblast Angel 1 Hero of Bladehold 1 Hero of Oxid Ridge 1 Suture Priest 1 Hellrider 1 Odric, Master Tactician 1 Aurelia, the Warleader 1 Firemane Avenger 1 Frontline Medic 1 Legion Loyalist 1 Tajic, Blade of the Legion 1 Purphoros, God of the Forge 1 Medomai the Ageless 1 Felhide Spiritbinder 1 Sphinx's Disciple 1 Iroas, God of Victory 1 Keranos, God of Storms 1 Thousand Winds 1 Hallowed Spiritkeeper 1 Arashin Foremost Planeswalkers (4) Lands (37) Spells (30) 1 Sol Ring 1 Fellwar Stone 1 Goblin Bombardment 1 Kirtar's Wrath 1 Decree of Justice 1 Skullclamp 1 Opposition 1 Wayfarer's Bauble 1 Coastal Piracy 1 Mind Stone 1 Field of Souls 1 Dismantling Blow 1 Ghostway 1 Prismatic Lens 1 Pollen Lullaby 1 Springleaf Drum 1 Goblin Assault 1 Armillary Sphere 1 Elixir of Immortality 1 True Conviction 1 Phyrexian Rebirth 1 Increasing Devotion 1 Blustersquall 1 Vandalblast 1 Assemble the Legion 1 Azorius Cluestone 1 Boros Cluestone 1 Spirit Bonds 1 Make a Stand 1 Pore Over the Pages Check out our comprehensive Deck List Database for lists of all my decks: SIGNATURE DECKS Purple Hippos and Maro Sorcerers

This tells you it's card number 10 our of 131 in the set
Mox Jet, the black Power Nine piece, commands extraordinary PSA premiums