I am confused with Death cart. I don't have so much experience with this card, and I must admit that the games where I used it, it was not always a spectacular card. But on the other hand, I still think it's underrated because for me this card seems still very powerful. Let's compare with tactician : tactician has a drawback, you discard your hand when you play it. But the benefit is so strong that it worth it, and it shows that a very bad hand and a very good hand is better than two average hands. For Death cart, I feel it is more or less the same… +$5 worth the pain of gaining two ruins.
For me, Death cart seems like a very good support for good engines (with +buy), $5 is just a lot. And for alt-VP, or slogs, or games where you want to three pile, DC is useful too… I really don't think it is well ranked here.