I have a monster X (none in particular), and a card says with Y (again, none in particular) in its name. What is the criteria for monster X being a part of name Y?
For example, this question asks whether a Twilightsworn is considered a Lightsworn monster. The answer is yes, but how is this known? Is it solely because there is "Lightsworn" in "Twilightsworn" ?
Other examples include Dracoslayer in Draco Slayer_____.