Commonly used Sources

-All ravnica cards on scryfall: https://scryfall.com/search?as=grid&order=name&q=type%3Acreature+%28set%3Arna+OR+set%3Agrn+OR+set%3Agtc+OR+set%3Artr+OR+set%3Agpt+OR+set%3Arav%29

-The Novels

-The Comics