Aggro-Midrange-Control is a spectrum and, imho, this deck is positioned between Midrange and Control.

It's not classic Control because it just doesn't sit there playing draw go (think Miracles), it's not aggro because it's not aggressive enough (that's pretty clear) and it's a bit threat light to be "classic" midrange. The difference I see between Shardless and pure Control is that you're more aggressively using your resources (lands, graveyard with DRS) instead of just sitting back. There are lots of games in which you'll try to resolve spells on curve (1 drop, 2 drop, 3 drop, even 4 in the case of Jace) instead of just waiting (hence the Tar Pit argument raised earlier).