Blighsteel's mean, Lattice and Forge are expensive, Top makes games really slow, and the
Urza lands overtax the deck's color requirements.
I mean yeah, I've put in some expensive cards when I already had them to put in, but I've built multiple other EDH decks by now and I want them all to be as good as this one. I might not be a dollar-card budget player, but I can't just throw money around on random singles constantly.