"The Fabled Unicore".
Fiend Roar Deity Beast
"The Fabled" known in Japan as "Demon Roar God Beast" (
Similar to how "Fabled" have their archetype-theme about Fallen Angels, "The Fabled" also have their own theme. All of them represent legendary/mythical creatures of the animal kingdom.
Because most of these monsters gain abilities when discarded, they work well with "Dark World" archetype. Another good card to use with them is "Doppelwarrior", as their effects allow him to almost never be a dead draw.