Salvager of Ruin

• WWizards of the Coast2019-07-12
  Official Ruling
  Because targets are chosen for activated abilities before costs (such as “Sacrifice Salvager of Ruin”) are paid, Salvager of Ruin’s ability can’t target itself.
• WWizards of the Coast2019-07-12
  Official Ruling
  Permanent spells that were countered earlier in the turn never entered the battlefield, so they are not legal targets for Salvager of Ruin’s ability.
• WWizards of the Coast2019-07-12
  Official Ruling
  Salvager of Ruin’s ability can target a permanent card in your graveyard that was put there from the battlefield before Salvager of Ruin entered the battlefield during the same turn.
• WWizards of the Coast2019-07-12
  Official Ruling
  A permanent card is an artifact, creature, enchantment, land, or planeswalker card.

Rulings via Scryfall