It's not just Sonic that this could work for, but really any form of video game movie
3 Emet-Selch, Unsundered Esper Terra Gogo, Master of Mimicry Golbez, Crystal Collector Hope Estheim Joshua, Phoenix's Dominant Kefka, Court Mage Kefka, Ruler of Ruin Kuja, Genome Sorcerer Quistis Trepe Shantotto, Tactician Magician Tellah, Great Sage Terra, Magical Adept The Emperor of Palamecia The Lord Master of Hell Trance Kuja, Fate Defied Venat, Heart of Hydaelyn Vivi Ornitier Xande, Dark Mage

3 Chaos, the Endless Cid, Timeless Artificer Cloud of Darkness Diamond Weapon Exdeath, Void Warlock Fang, Fearless l'Cie Freya Crescent G'raha Tia Gaius van Baelsar Garland, Knight of Cornelia Garnet, Princess of Alexandria Giott, King of the Dwarves Gladiolus Amicitia Ignis Scientia Judge Magister Gabranth Locke Cole Neo Exdeath, Dimension's End Omega, Heartless Evolution Prompto Argentum Queen Brahne Quina, Qu Gourmet Quistis Trepe Ragnarok, Divine Deliverance Reno and Rude Ring of the Lucii Rinoa Heartilly Rufus Shinra Rydia, Summoner of Mist Shantotto, Tactician Magician Snow Villiers The Emperor of Palamecia The Lord Master of Hell The Prima Vista Tidus, Blitzball Star Torgal, A Fine Hound Ultimecia, Omnipotent Ultimecia, Time Sorceress Ultros, Obnoxious Octopus Vanille, Cheerful l'Cie World Champion, Celestial Weapon Yiazmat, Ultimate Mark Zack Fair Zidane, Tantalus Thief

Utility Artifacts/Enchantments I run Archeomancers Map because while we dont need to have a lot of mana, theres nothing wrong with ramp
Each of the two cards that are part of this meld pair has a meld icon in the upper left hand corner of its front face and half of the larger creature card on the back
If you have experience of other TCGs, this is probably a reasonably familiar mechanic to you, as its similar to evolving a Pokemon