Honestly, I feel Civic Wayfinder is much, much better. Being able to get your next landdrop guaranteed is better than maybe ramping a little. Wayfinder is also better with blink or other forms of recursion. However, I am running Tireless Provisioner and am eager to see it in action. I just don't feel it occupies the same space as Wayfinder, as you'd usually be looking to play it t4 to get a landdrop to go along with it.
I, too, am adding Lightning Spear. I do not run equipment support, but I think 'equip 1' is what makes the card worthwhile. And a bad bolt is still a bolt. I'm swapping it for Thermo-Alchemist, since I feel it can be run more effectively in more different aggro archtypes. Definitely not a top-tier card by any means, mind you, but still a card I'd be more than happy to include in most aggressive-leaning Rx decks.
Also I am edging ever closer towards just changing my entire Boros section to stocky bearded guys that care about weapons. (Koll, Bruenor and Reyav)
And the same goes for me, I still run the slime but didn't mention it because between it having deathtouch and it killing lands it is a whole lot better than some of the other green dudes that don't like artifacts or enchantments very much. (Also I just plain forgot about it, lol :p) But yeah I agree with what was said earlier, Evoke just plays so well with some things in the cube, my players always have a lot of fun with the evoke cards we run.
I am still running Conclave Naturalists as well, and the Breaker is going in for that. I agree on it being definitely worse than Reclamation Sage, but my cube does have some artifacts and enchantments that can take over the game if left unanswered.
On the Entomb-on-a-stick: I think it having deathtouch is good enough for it to see play in multiple decks. Mind that it can tutor any card to the yard, so getting a fatty to reanimate or some value spell like Roar of the Wurm or Deep Analysis seems good enough for me. I still run Stinkweed Imp, and this seems more or less like a more surgical tool compared to the shotgun blast that is dredge.