Potentially summons a 6/6 at the end of pretty turn. Admittedly that's pretty optimistic but if you're holding the board with a few minions when you play this is pretty nasty. 7 mana is probably way too much tho. Maybe at 6, it would be alright.
Terrible when you're behind. If your opponent has nothing on board and you have a savage roar or bloodlust they'll usually have to choose between removing the 1/7 and risking death or aoeing the 1/1s and having to deal with them again the next turn. But that's only in a token deck and not enough of a payoff to sell it for me.
Since the expansion is going to be pretty dragon centered I think I would rather pay 2 more mana for Onyxia. There just seems to be quite a lot of synergy with her since she has the Dragon tag (buffs, dragon in hand cards ...), you can use the minions in some way immediately and the main body is a threat that is hard to ignore.
One one hand Shu’ma offers quite a lot of value if it sticks but I just can't see it doing that for more than a turn.
Seems too slow for token decks and a board of 1/1s is nothing by turn 7. The body of the minion is also pretty weak. Maybe it could find a slot in quest hunter but, other than that, it seems pretty hopeless.