I kinda don't really like the idea, because Earth already has a variety of spell cards and skills, yet most of them are defensive and not really about lowering the opponent's HP. I guess it's okay though, because you would be forced to duo to play this card (unless, of course, you mean to use it on a shrieker, but shrieker rush = ftw and this would just slow it down...maybe increase creature's HP by some to make it more earthly and so you can use it on stone dragons or something?)
Hm...I wonder how this would work with dive...
btw, repost the link in the card candidate forum if you want the Curators to check it again.