Killer Bunnies

The game's main site is at http://killerbunnies.com/

To quote from the page:

Killer Bunnies is a fast paced, action filled card game, in which you must try to keep as many Bunnies alive as possible, while eliminating your opponents' Bunnies and trying to find the Magic Carrot. The problem: Your opponents are armed with weapons and will stop at nothing to keep you from winning the game, which can get dreadfully vengeful, horribly nasty, hilariously messy, and just plain fun!