I tested pack rat. And was not good.
You started needing 3 basics in your deck to not loose vs a wasteland so easy (i think more that 2 basics are waste of space. Cause you need the doubles so u cut a fetch).
And when your commit to the rat plan your other plans get bad. You just stop investing in storm to invest in rats. And you can usualy just make a rat per turn. So facing a tarmo or a delver. U would need to many turns to race it.