Every distinct wording since 2010, newest first.
July 12, 2019 · Core Set 2020
Some triggered abilities are written, “Whenever [a player] gains life, . . . .” Such abilities are treated as though they are written, “Whenever a source causes [a player] to gain life, . . . .” If a player gains 0 life, no life gain event has occurred, and these abilities won’t trigger.