Another nice card idea, Ajit, you know what you’re doing.
First off, it’s balanced, no doubt due to the critique and suggestions of other members before this review. Changing the element to Earth was a good move, because it works well with Earth – this card will synergize well with the high HP creatures and burrowed creatures that the element specializes in. Also, because Earth does not have CC that can kill, this card opens up a new aspect of the element itself as well as the other elements it can duo with. For example, this card would work well in a Fire/Earth deck with Fire Shield, Fire Storm and Fire’s other CC cards.
The effect of the card itself is very useful in many situations and I can see this card in many decks because of that fact. It kills 1 HP creatures, so popular decks like RoL/Hope will fall to its strength. It also opens up control duos with Earth, like I said above, such as Fire/Earth, Entropy/Earth with Pandemonium to take down high HP creatures, or Air/Earth with Thunderstorm and Owl’s Eyes. You could also just use six copies of this card in a deck and use it multiple times in one turn to kill creatures (For example, a three HP Shrieker will die if this card was used twice). These strategies could cut down rush and stall decks alike.