They clearly missed divine shield and taunt on this one ! ;)
That is a really strong for a common!. First what comes to mind when looking at this card is Zilliax and Al'Akir the Windlord. Wow are we really comparing common to really good legendaries ???
Well there are some differences. Both legendaries have taunt and divine shield, which are not present in walking fountain. This is quite difference. Opponent can ignore this card and go face if looking for lethal, but in any other case this card forces removal.
Biggest issue with this card is fact that it is slow. Can Shaman get to turn 8 to play this big boy? We still need to see some more cards for shaman, but with what have been revealed so far (swampqueen Hagatha and her scheme and perhaps even newly revealed Muckmorpher(Muckmorpher thread here)) we might hope for shaman to be a thing now.
I really cant say it will be played 100% sure, but i like this card and find it playable at least, hope to see it in constructed next month. Tbh im surprised this card has no overload attached.