12 Jul 2019
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.
12 Jul 2019
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.
12 Jul 2019
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.
12 Jul 2019
A permanent card is an artifact, creature, enchantment, land, or planeswalker card.