That must be the true meaning of "face hunter" kappa
Jokes apart, it's rng, but also possibly some experimentation in the light of the incoming nerfs, ie vicious syndicate reported that Hunter might be able to carve his own place in the high tiers after the nerfs.
If the cost was 8 it would be 100% unplayable. If the cost is changed to 7 it will be almost unplayable except for the greediest players. In my opinion the cost should be 6, even if it's a small nerf it's still something and people probably would think two times before running two Cubes instead of one. Also some people say stats doesn't matter here but some reduction on the attack wouldn't hurt neither. So for me would be something like this:
6 mana cost
same deathrattle effect
Seems like a fair nerf for me if you don't want to kill the card totally.