Neighborhood Guardian triggers on more things than Sunhome Stalwart does, and though the bonus is temporary, you can get multiple triggers in one turn.

Ordruun Mentor I think is a much better version of Sunhome Stalwart, triggering on more things, and getting to give first strike to any of your creatures. Slaughter the Strong has never seen great play, and is even less needed now that we have Kirtar's Wrath.

Pushing spells as the UR theme meant that the gold section had gotten to be more good stuff rather than signposts Third Path Iconoclast is a truly gold Saheeli, Sublime Artificer. Ecstatic Electromancer takes over the hybrid slot as a card that still works in the spells deck, but can also be played in a wider variety of Ux and Rx decks.

Carnophage is definitely past its prime, while Snarling Gorehound carries buffs well and gives card selection to aggro decks.

Leering Onlooker is a great blocker with a good "flashback" effect for after it dies, gets sac'ed, or gets milled. Cutting Lazotep Reaver reduces keyword complexity as it is the last card with amass.

The CMM creatures appear to be alright, so we can scale back the extra removal (Go for the Throat) and instead add what I assume is an insane card for any aggro or sac deck in Afterlife Insurance.

Frantic Scapegoat is pretty similar to Phoenix Chick, but I like the idea of being able to pass menace on to one of your larger creatures more than the chick's ability which feels a little "win more."

Lightning Mauler is mid, while 3 toughness on Reckless Detective is pretty big, as is the fact that it can filter cards.

Lagomos, Hand of Hatred has been pretty good, so Harried Dronesmith should be as well. I had to take something out, and Arc Trail has honestly probably always been a little too good.

Fight with Fire is never getting cast with kicker, so Torch the Witness should be a much better scaling removal spell, with a little bit of extra value.

Rubblebelt Maverick does just about everything a green deck could want to do with a 1-drop. Something had to go, so I'm going to see if ramp still functions with 1 fewer dork.

Predatory Rampage is fun, but a 5 mana card that requires you to have multiple creatures in play to make it good is asking a lot. Scuttling Sentinel is Snakeskin Veil stapled to a pretty good 2-mana body, and I like this effect being available to Ux tempo decks.

Hard-Hitting Question costing half what Ram Through does makes up for the difference in cost, I think.

Reclamation Sage's body is pretty below-rate for a 3-drop, while Pick Your Poison is an efficient, versatile removal spell.

Continuing the tradition of cutting generic goodstuff, Meddling Youths is top end that rewards you for the RW go-wide plan, while being at worst 4 haste damage.

Escape Tunnel is a strictly better Evolving Wilds. Sweet.

Insidious Roots is a really intersting card that I thought it was worth trying to support. In that vein, Grisly Salvage is also out for Nyx Weaver.

In addition to a few other cards above that trigger Insidious Roots, we also have:

Hooting Mandrils in over Once and Future, which hasn't seen much play that I've noticed.

Reassembling Skeleton in for Fearless Skald in order to re-balance the colors with all the new hybrids added in this update.