There are startlingly few 4/4s for 5 mana in white that don't have flying, given that there are loads of them for that do have flying (starting with Serra Angel and carrying on). There's Wandering Graybeard, Lightwielder Paladin and World Queller, but they're all ; there's not a single 4/4 as far as I can see, apart from Changeling Hero which has the drawback mechanic Champion.

All the above are at least uncommon, so I don't mind that this is uncommon, although a french-vanilla vigilant creature could certainly be common if it were smaller. This is edging into the "big dumb white guys" territory of Rockcaster Platoon, Crowd Favorites etc.

I wonder if this and UG04 Candon Irregulars are too similar.

Flavour-wise, I don't think I want actual giants in this steampunk world - it'll clash with concepts coming in set 2. But ogres should probably be okay. Can an ogre be white? Maybe, if she's well-behaved enough.