It's like a Sentinel with bite! This card is pretty cool because it won't die to things without Deathtouch, Wither, Infect, or Double Strike but it kind of sucks at the same time because it won't kill the other creature. However, it can stop creatures with Trample dead in their tracks. But, it doesn't help that you have to have a mana open to activate the ability. It's a real middle-of-the-road type of card in my opinion. It's a great blocker, but not a great attacker.
Pros: Can survive most combats, immune to trample
Cons: Can't kill much, mana required to activate