Fucusya generates too much rain IMO. Her best feature is that she makes a 4 prov card gain an extra 6 turns of rain (12 points) which is just absurd.
If you play her to resurrect a 4 prov card you can generate anywhere from 20 to 24 points. And if you use to res a high end gold, chances are you'll get even more points. There is no downside to Fucusya, which is the real problem.
Resurrecting bronzes should not generate 20+ points, just absurd... The amount of rain generated should be cut in half. This would also lessen abuse potential with Rioghan and Messanger of the Sea.
But nerfing Fucusya is just one of many nerfs needed for busted cards in this game. KoB + Jackpot, Assimilate being able to copy golds, the randomness of Bribery, so many strong combos in this game means that if you nerf some of the top ones, you also need to nerf the next 3 in line behind it or else the meta just shifts to a single new deck.