"Vines of Vastwood" is basically a better Titanic Growth. It gives hexproof along with the same +4/+4, for the same cost. The Unblockable isn't terribly necessary (usually) because I can mostly just trample over them. As to Enlarge, I'm mostly looking for instant-speed buffs, so I don't use a sorcery and show my hand before they declare blockers.
I feel that my biggest problem is a lack of creatures. I think I need to take it to a full set of Dungrove Elders, and possibly 2 more creatures (perhaps "Charging Badger" from BNG)