While I do think Soul Exchange is a good reanimation spell, the fact its also a Thrull payoff is a good example of why Fallen Empires is a failure both in the short and the long-term
Thanks to providing potentially unlimited Rad Counters, Nuclear Fallout can offer lethal levels of both damage and Mill
I think its too much to hope for fewer Legendaries, but Ill take it if they at least reduce the amount on non- UB product
Plus, gaining a life from spells is what the Swamp King loves doing
The deck brought long-forgotten cards like Varchilds War-Riders and Mercy Killing into my playgroup and created a very political arms race, even if only for a few months
It can make otherwise prohibitive activations costs a lot more reasonable, and when paired with the right mana rock, quite unreasonable outcomes