all monarch cards yugioh YU-GI-OH! - The Monarchs Erupt (SR01-EN038) - Structure Deck: Emperor of Darkness - Edition may be 1st or Unlimited Edition Monarchs Return! 5 New INSANE

You could steal and play cards out of your opponent's deck

The terrain affects monsters and changes their Attack Power and Defense Power

One investor observed, Sealed doesnt seem to have this problem

While you can manually upload your collection by adding cards individually, you can't export it without the premium feature

Altered Ego Auton Soldier Callidus Assassin Clever Impersonator Clone Copy Artifact Copy Enchantment Copy Land Copycrook Dack's Duplicate Evil Twin Flesh Duplicate Gigantoplasm Jwari Shapeshifter Machine God's Effigy Masterwork of Ingenuity Mirrorhall Mimic Mirrormade Mockingbird Naga Fleshcrafter Omni-Changeling Phantasmal Image Phyrexian Metamorph Pirated Copy Progenitor Mimic Protean Raider Quicksilver Gargantuan Sakashima the Impostor Sakashima's Protege Sakashima's Student Sculpting Steel Stunt Double Synth Infiltrator Undercover Operative Vesuva Vesuvan Doppelganger Vizier of Many Faces Wall of Stolen Identity

Though its hard to say if it contributes to its high price tag, this card does have a unique story behind it