It's a nice deck. My only concern is the turning of lands into creatures. If you made the deck Bant (W/G/U) then you can splash some +1/+1 counters into this deck and make them last a little longer. Same thing if you added Kiora who can untap up to one creature and land (which would be two land creatures if you used her effect). Also some dispels and
ondu rising would be good because life-gain and control are always a good combination. If you don't want to add the green then make sure you use some
sheer drop,
encircling fissure and some
evolving wilds. And remember, the trick is to play instances and sorcery spells but at the same time you want to do more than just bounce creatures back and forth. Actually being able to play aggressively should be a function of this deck as well. Just something to keep in mind.