Ajani's Last Stand

Oracle Text
Whenever a creature or planeswalker you control dies, you may sacrifice Ajani's Last Stand. If you do, create a 4/4 Avatar creature token with flying.
When a spell or ability an opponent controls causes you to discard this card, if you control a Plains, create a 4/4 Avatar creature token with flying.
Or is this one supposed to describe their battle in the past?
https://www.themarysue.com/magic-the-gathering-vivien-reid/
Bristling Boar's flavor text confirms it.
We don't really have Vivien's backstory yet.
PS: The "if u have a Plains" downside....??? flavor???