This card is actually quite weak for an uncommon. Between the UU in its casting cost and the expensive activation cost, it's gonna be quite clunky and unpleasant. At the moment this guy isn't really a playable card.
The ability is just not all that powerful. This guy is definitely playable now, but probably should be a common. It's very often just going to be a niche way to give vigilance. Haven't checked all the cards to see what other interactions might come up. If you have a claustrophobia type card, or an activated ability that involves (cheap) tapping, then this gets slightly better.
This card is actually quite weak for an uncommon. Between the UU in its casting cost and the expensive activation cost, it's gonna be quite clunky and unpleasant. At the moment this guy isn't really a playable card.
+1 toughness,
to 
, activation cost from 
to 
does that make it competitive? or is the ability itself just not a good one?
The ability is just not all that powerful. This guy is definitely playable now, but probably should be a common. It's very often just going to be a niche way to give vigilance. Haven't checked all the cards to see what other interactions might come up. If you have a claustrophobia type card, or an activated ability that involves (cheap) tapping, then this gets slightly better.
I don't think this should be a common. Vigean Graftmage was uncommon in Dissension and for good reason. This goes crazy with loads of tap abilities.
(On the other hand, if your target complexity level is more like Modern Masters than a typical NWO-compliant expansion, common would be fine.)