phase salvager is completely useless in its current form. Having to use other cards to buff it to make it useful doesn't leave much room for perms in a deck.
it would be much better if it was 0/1 where it could die to any CC. Otherwise, make the ability occur when the creature is played, in which case, you might as well turn it into a spell...
Seriously tho, I can see the gravy salvager being much more useful in aether duos. With the exception of SoP (which is banned in many pvp events), phase salvager is a dead card.
Dune Scorpion is a dead card. you have to have other cards that buff it. You can't even use it in a mono time deck, you have to have a duo at least. Dune Scorpion is a dead card.
Dune scorpion is an awful comparison.
First, dune scorpion's ability is unique. No other creature has neurotoxin ability. Whereas gravy salvager shares the same ability with phase salvager, and it doesn't require a buff.
Second, neurotoxin continues to build after scorp dies. Salvager only works if deflag, pulvy, EQ, or SoF is used (assuming the creature isn't killed first)
Third, you only need 1 dune combo for a dune deck to work. With salvage, you likely need multiple since 1 will get CC'd. Also, phase salvager's attack is not enough to make it a decent attacker in rushes.
Bottom line, gravy salvager makes phase salvager dead. Phase salvager's requirement for a buff makes it useless in almost every deck. If you want to use salvage ability, you won't have much space for perms after buffs. If you want to rush, there are much better rushes than buffing phase salvagers.