4 mana 7/7 is a term used to refer to a well-balanced, very reasonably-statted minion. 4 mana 7/7s are rarely if ever seen in play, and when they do appear tend to have a minimal impact on the match. Blizzard is widely expected to add more 4 mana 7/7s in future, specifically in order to strengthen the ailing shaman class.
How many Blizzard employees do you need to fix a lamp? It does not matter, because they cannot balance the ladder.