darksteel sentinel, elvish visionary, eternal witness, wall of , sundering titan.

do you have expedition map?  It might be better than realms uncharted here.  In fact, I'm almost certain it would be better.  Mulch would be better, too, if you have another.  Yeah, i'm thinking realms totally sucks in this deck.  If you have a single urza land out, you will get that one and reduce your chances of the other two.  The best use would actually be to trash a forest and whatever urza land you already have, slightly increasing your chances of drawing the urza lands you need.  Not a very good use of a card.  Even nature's lore is prob better.

Add infect stuff to discourage attacks in multi?

CARVEN CARYATID - good sub for wall of blossoms

Add terrifying presences; maybe replace the crummier golems...