I don't like the fact, that a card with an useful ability have better stats/cost ratio than a the "half-vanilla" creatures.
As like Graviton salvager. It's 1|5 for 1 and has a counter-ability. And there's only 1 ability.
This card has 2 ability and 1 is the counter, the other is an useful ability. The limited CC prevent is compensated as it's a creature defending other creatures and salvager is limited too. 2 salvager only prevents 1 permanent/turn, but these are cumulative. The other, active skill is good at it's own as like it's immune to (the first) Plague, Firewall, Unstable gases. And has a huge potential with

( LemMitorush, cute hamster kicking your ass out

).
And Graviton salvager gained the big HP for the thematic (of course, this card needs for buffing it's effects). My suggestion is making it's unupped HP for 5 too as like the salvager. It's still can survive any damaging CC for a turn and the other CC sources can be done as well (with other lemmings). The upped can't compared with any card, but it's nearly the same as an unupped+a Chaos power, so it's okay. If we want to make it more similar to Grav. salvager, it can be 2|5 (or 2|6) for 1

.