Prowess of the Fair

• WWizards of the Coast2007-10-01
  Official Ruling
  If Prowess of the Fair and another nontoken Elf are put into your graveyard simultaneously (by Akroma's Vengeance, for example), the other Elf will cause Prowess of the Fair's ability to trigger.
• WWizards of the Coast2024-06-07
  Official Ruling
  This cards was originally printed with the "tribal" card type. That card type has been replaced with "kindred". This change does not affect the gameplay function of this card.
• WWizards of the Coast2024-06-07
  Official Ruling
  Kindred is a card type that allows noncreature cards to have creature types. For example, Echoes of Eternity is an Eldrazi (although not a creature) while on the battlefield and an Eldrazi card (although not a creature card) in zones other than the battlefield.
• WWizards of the Coast2024-06-07
  Official Ruling
  While it appears only on cards that already have other card types, kindred is a card type and will be counted by effects that refer to the number of card types among cards in a zone.

Rulings via Scryfall