Real Magic cards are highly resistant to bends, so they usually return to their flat shape with no sign of a crease in the middle

Scientists Aang and La, Ocean's Fury Aang, A Lot to Learn Aang, Airbending Master Aatchik, Emerald Radian Abandoned Air Temple Aberrant Return Abigale, Poet Laureate Abomination, Terrifying Titan Aboroth Abstract Iguanart Abstruse Interference Abzan Advantage Abzan Ascendancy Abzan Battle Priest Abzan Falconer Academy Elite Access Denied Accomplished Automaton Ace, Fearless Rebel Acid-Spewer Dragon Acolyte of the Inferno Action News Crew Adaptive Gemguard Adaptive Snapjaw Adder-Staff Boggart Additive Evolution Adherent of Hope Adorned Crocodile Adrenaline Jockey Adventurous Eater Advocate of the Beast Aegis Sculptor Aegis of the Legion Aerie Auxiliary Aerie Bowmasters Aerie Ouphes Aerith Gainsborough Aerith Rescue Mission Aeromunculus Aeronaut Cavalry Aetherstorm Roc Aetherwind Basker Aeve, Progenitor Ooze Afiya Grove Agatha's Soul Cauldron Age of Ultron Agent Bishop, Man in Black Agent Maria Hill Agent Phil Coulson Agent of the Shadow Thieves Agent's Toolkit Aggressive Negotiations Ainok Artillerist Ainok Bond-Kin Ainok Guide Ainok Survivalist Ainok Wayfarer Air Nomad Student Airlift Chaplain Ajani Goldmane Ajani Steadfast Ajani's Comrade Ajani's Pridemate Ajani, Adversary of Tyrants Ajani, Caller of the Pride Ajani, Nacatl Avenger Ajani, Strength of the Pride Ajani, the Greathearted Akroan Sergeant Akroan Skyguard

For starters, a couple of game types like Draft require you to buy in, just like paper (though in all fairness, they're not the 'norm')
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This is partly due to the Reserved List, a list of cards from the sets Alpha to Urza's Destiny (19941999) that Wizards has promised never to reprint