I've noticed that in some cases (Demonic Disciple, Infected Devil etc.) when a card is tranformed it loses its effects, loses its subtypes and has full health, while in other cases (Demonize, Vengeful Warrior, etc.) that is not the case.
I have not, however, seen a way to tell those two effects apart. Is there a way to know in advance which cards do what?
Also, what exactly is the difference bettween having a card transform while keeping effects (like Vengeful Warrior) and having a card evolve (like one of the Coyles)?