So what does Anubis have that Nymph doesn't? High HP.
Not the primary reason people use it over Nymph. The primary reason is this: it costs
to summon and
to use, therefore reducing the load on
for cards like Fractal or TU for Flying Eternities or what have you.
The secondary reason is this: Anubis' ability costs 2 when unupped, 1 when upped. Nymph's costs 3 both upped and unupped. There's no reason to spend that much
when you can even out the quanta distribution.
Anubis is the only creature that's doing a Nymph's job and doing it better. It is, indeed, the real problem. Not the Nymph. That said, Quint overshadows both, but if you wanted continuous Quint, I think Nymph is the only creature that should rationally be capable of that. Regardless of whether Anubis changed or not, it still needs an ability cost reduction, however.
Napalm and I wanted to make Anubis a mid-range attacker for Time, but it's getting Ghost now. Sure, it's expensive, but it's another attacker which is just what Time needed. So, when I'm thinking about this issue, I'm thinking about new abilities for Anubis. In fact, its current ability doesn't even make sense thematically. The death god Anubis was a god of mummification. He protected the dead and lead them to the afterlife. He did not prevent death or caused it by himself.