Summary: New way to draw cards.
Comment: The first question I have with this card is whether the difference is absolute or simply allied – enemy i.e. if you have less creatures than opponent on the board, you don’t get any draw? Assuming the former, this card is made to benefit a player who is already leading. So why would Sony do this? My guess is because of new Set.3 abilities, Sony is anticipating “every turn, new creature” strategy would no longer be a smart move. Perhaps, you may be winning in terms of number of creatures on the board, each of your creatures are very susceptible. So this is one way to support Winny deck or “every turn, new creature” strategy.
If the latter assumption is the correct, then this card can be used to get the lead back in the game when you are actually losing. In either situation this is interesting card.