Want to sacrifice your commander
A person has to be somewhat familar with the details of a Pokmon card in order to identify a fake from the back, but I find it very useful to be able to do so, as it makes sorting through a large number of cards relatively easy to do
Wondering what else would tell its a fake

Angel of Suffering Ashiok's Reaper Ashiok's Skulker Banehound Boneyard Lurker Braids, Arisen Nightmare Braska's Final Aeon Brokkos, Apex of Forever Brokkos, Apex of Forever Carnival Hellsteed Cavern Whisperer Chittering Harvester Cruel Somnophage Cursed Wombat Devourer of Memory Doom Whisperer Dread Presence Dreadwing Scavenger Dream Beavers Dream Eater Faceless Butcher Faceless Devourer Falthis, Shadowcat Familiar Fear of Abduction Fear of Being Hunted Fear of Burning Alive Fear of Exposure Fear of Failed Tests Fear of Falling Fear of Immobility Fear of Impostors Fear of Infinity Fear of Isolation Fear of Lost Teeth Fear of Missing Out Fear of Sleep Paralysis Fear of Surveillance Fear of the Dark Fiend Artisan Foul Watcher Gibbering Barricade Gloom Pangolin Gloomfang Mauler Gravegouger Grimdancer Haunt of the Dead Marshes Helica Glider Hell Mongrel Hunted Nightmare Hypnox Insatiable Hemophage Kathril, Aspect Warper Labyrinth Raptor Laquatus's Champion Leyline Prowler Lurrus of the Dream-Den Mesmeric Fiend Mindleecher Necropanther Nethroi, Apex of Death Nethroi, Apex of Death Nightmare Otrimi, the Ever-Playful Ovika, Enigma Goliath Persistent Nightmare Petradon Petravark Plague Mare Psychic Symbiont Sephiroth, One-Winged Angel Silvar, Devourer of the Free Slitherwisp

At the beginning of each end step, if you gained life this turn, untap Ragost