The main way to check for whether a card is real is that the bottom right corner of any official Yu-Gi-Oh card has what Konami refers to as the Eye of Anubis symbol
However, this rarity type does not fully align with Special Illustration Rare and is not the same as them

Advanced Search Sets Random Syntax Aatchik, Emerald Radian Ambush Gigapede Amzu, Swarm's Hunger Army Ants Bane of the Living Battlefly Swarm Bilious Skulldweller Blade of the Swarm Blightbeetle Blister Beetle Bloatfly Swarm Brain Maggot Brain Weevil Brood of Cockroaches Buzzard-Wasp Colony Carrion Ants Carrion Beetles Carrion Grub Carrion Locust Caustic Crawler Chainflail Centipede Chitin Gravestalker Comet Crawler Deadly Grub Decimator Beetle Delta Bloodflies Devouring Swarm Dimir Spybug Dross Hopper Dune Beetle Durable Coilbug Endless Cockroaches Eumidian Wastewaker Fen Hauler Flow of Maggots Fog of Gnats Foundry Hornet Fretwork Colony Fumulus, the Infestation Giant Ambush Beetle Giant Cockroach Giant Fly Gleancrawler Golgari Longlegs Grave-Shell Scarab Great Fierce Bee Heartstabber Mosquito Huskburster Swarm Infesting Radroach Insatiable Skittermaw Insectoid Exterminator Jagwasp Swarm Kathril, Aspect Warper Kraul Raider Kraul Swarm Kraul Whipcracker Lord Dregg, Insect Invader Mazirek, Kraul Death Priest Mind Maggots Monstrous Carabid Mortician Beetle Mortipede Nantuko Husk Nantuko Shade Necrosquito Perilous Shadow Pestilent Syphoner Phyrexian Battleflies Plague Beetle Plague Fiend Plague Stinger Primordial Gnawer

This makes two tokens for Token decks
Most normal, rational people understand that to mean one of white, blue, black, red or green