When you place a -1/-1 on anything you get a snake when that happens yes. But she can be used as a strong medium for the deck because the way you run her depends on the cards you have at your disposal. Also when you have cards that just drop -1/-1 counters on stuff throughout the game and also
hinder your opponent because -1/-1 counters (unlike actual damage) is not removable). So if you're playing creatures such as the
exemplar of strength then your creature gets stronger as the game goes by. This also creates a
balance because while your creatures are recovering from the -1/-1 placement you could also put them on other people's creatures and slowly build up your army.