The good news is that the rest of the Mythics from Magic 2010 clearly fit the definition, and there are at least arguments for the rest being classified as Mythics
One of the best options is Acolyte of Bahamut, which lets you discount Dragon spells since Dragons have a lot of attack triggers and Karlach provides extra combat steps
Then pay two generic mana and tap it to cast a copy of Dramatic Reversal (gaining three life), untapping all your permanents, not including lands, and the Isochron Scepter
Teferi, Time Raveler is the same way, as his passive power prevents players from casting instant-speed spells the moment he touches the table, preventing counterplay at a very early turn: as early as turn two if you can get some quick one-cost mana ramp out turn one
I live for assignments like that
Each Glimmers of the Realm Puzzle includes a collage of different Disney characters that represent one of the magical ink colors found in Disney Lorcana