As a nitpick, Realms Uncharted probably does speed up the deck's clock, by getting both halves of Depths/Stage or whatever other piece you're missing. (Intuition would do the same thing but also grab a Life from the Loam or 3 Ancient Grudge which is real exciting, but not every lands deck can support blue spells.)
Still I don't like the idea of cutting Grudge over it. I'm not even sure I like the idea of running only 3 Grudge. If you're not steamrolling all of your Workshop opponents, playing this doesn't make a lot of sense to me.