Referring to Anya, a two-star whiteboard, this three-star whiteboard Witch Sacrifice shouldn't be particularly strong either.
But with the Cup of Blood, the situation might be different.
After the great ebb of the Mythical Era, the stronger the divine spirit, the more power it retains. For instance, Odin; only three main gods of the Norse Pantheon can be clearly manifested, the others are vague. Those more dispersed beliefs, like the nine Guardian Fairies of Avalon, have become so weak they are lesser than the Valkyries.
The situation in Shamanism is similar; the great ebb of universal worship seems like fish and shrimp stranded on the beach, only the larger ones can barely flap around.
To put it more plainly: after the great ebb of the Mythical Era, divine spirits like Emperor Zhenwu can barely maintain their status, but those like Third Grandmaster Hu of the northern outposts, extensions of the original Shamanism, have truly been left stranded on the shore.
