So it's like Grim Necromancer, but the body is a 3/3 instead of a 2/4 and the tokens offer some synergies with your deck (imps, murlocs, mechs). As GentilleMouche said, some tribe minions lose their effect if they are directly summoned on the board (like in the case with dragons and elementals). Hunter has better beasts, so this won't see any play there.
But I think, that in board flooding demon zoo decks this minion would make sense. We just need to see more tribe and/or token buffing cards.
It needs some type of synergy to be useful but if it does have that synergy, it could be powerful. It is a 4 cost 5/5 spread between 3 minions so it isn't bad per say. It's playable. Perhaps, we will see something as they reveal more neutral minions.