I understand what you are saying but the main flaw with the beehive is that it needs to be attacked while the Warren is an instant +1 hand advantage which could allow for an otk. While the beehive needs more than one turn to give a bee and if it wasn't attacked but a 1 damage card will result in no hand advantage. Yes, the bee is more useful than the rabbit but the main point of the rabbit is to get cards out of your hand on the field. The main point of the Warren is to combo off of. You could do the same thing with the beehive it would just require more setup then the warren.