Holy Urzatron, does this card suck! It's four and tap to tap something else down and then four and tap to kill a tapped thing. If it didn't require tapping it would be very expensive, but at least you could synergize the two abilities on the same turn. Even in Limited this is pretty expensive for what it does (and that''s coming from a guy who just won a prerelease with Nightfire Giant). This is on the low end of "good" in Limited and unusable anywhere else.
Pros: Can tap dudes, can kill tapped dudes
Cons: Abilities don't synergize well, abilities are expensive