Not to pry, but 5 water for 6 damage is worse than the following:
3 damage for free
1 damage for free
3 damage for 2
4 damage for 3
In fact, all of those also beat mummy, and the first two beat ash eater.
It's attack power to cost ratio is actually pretty poor.
And now for my usual mantra:
Before you post a card in the nerf this card section, please play WITH the card, not just against it.
Before you post a card in the buff this card section, please play AGAINST the card, not just with it.