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Puppets have almost no draw and very heavy finishers. If you draw Noah and two Orchids at the start after mulligan, you're stuck.
I would rather nerf Silva, making her effect non-stackable. The effect of De La Fil doesn't stack either. Nor does the effect of Kurva. The guy with the axe has a stacking effect – that's why he can reach round 7 and proc before round 8, but only if you happen to draw two Wisps. Kark has a stacking effect – but she also has a powerful drawback, and without evolving, she's just a body.
And yes, Furson is useless. There's nothing for him to attach to in the rotation, and in unlimited, it's too slow, and control blood usually plays through Cthulhu + Azazel. At most, against Zeus. In any case, blood doesn't have the same toolkit as dragons, so Furson is worse than Barmaglot (who, by the way, isn't a great card either).