In the Dominaria rules update, they got rid of the planeswalker redirection rule, where non-combat damage dealt to a player could be redirected to a planeswalker that player controlled. As a result of this a number of cards (such as Lightning Bolt) have been given errata so that they can now deal damage to planeswalkers.
Obviously the current oracle text is the source of truth for which cards can and can't deal damage to planeswalkers now, but is there a simple set of rules for which cards were changed so that you do not need to look this up every time in casual play?