Originally, manifest was a mechanic to work alongside morph, which is an ability that allows creatures to be played from your hand as a face-down 2/2 for 3 generic mana

Akim, the Soaring Wind Akroma, Angel of Wrath Akroma, Vision of Ixidor Ancient Spider Angel of Retribution Angelic Skirmisher Animus of Predation Anvilwrought Raptor Azorius Skyguard Baneslayer Angel Battlewise Aven Bonehoard Dracosaur Boon-Bringer Valkyrie Boreal Griffin Cairn Wanderer Captain America, Wings of Freedom Celestial Archon Chromanticore Cloud Crusader Cosmic Spider-Man Crimson Roc Crystalline Giant Death-Mask Duplicant Dragon Tyrant Dragonkin Berserker Dragonsoul Knight Drana, Liberator of Malakir Drogskol Reaver Eagles of the North Ekundu Griffin Ember Weaver Escaped Shapeshifter Firemane Angel Flailing Manticore Flowstone Sculpture Gabriel Angelfire Gisela, Blade of Goldnight Gisela, the Broken Blade Greater Morphling Halana and Alena, Partners Helica Glider Honorbound Page Hunted Dragon Illusionary Wall Indominus Rex, Alpha Infernal Spawn of Evil Infernal Spawn of Infernal Spawn of Evil Infernius Spawnington III, Esq
Poor 1 This is the lowest grade possible
For trading cards, it detects the card in the image, then performs detailed identification returning structured data such as card name, set, card number, rarity, and links to marketplaces
Phyrexian Metamorph Phyrexian Metamorph has seen extensive play across Commander and Cube