Originally Posted by
Tacosnape
Beast Within is meh. Even with the ability to make a 3/3 guy in a topdeck war and even with the ability to hit an opponent's Maze in a pinch, the fact of the matter is this. Beast Within is always versatile, but never really amazing.
I've been running Oblivion Ring in the sideboard of Zoo for quite some time. Specifically, ever since I realized almost every card I hate seeing with Zoo could be solved by Oblivion Ring. I don't think Beast Within is qualified to replace it.