The 2x
Sentinel Totem is useful game 2 sideboard when we're coming up against a large amount of removal targeting
Remorseful Cleric, which if we pulled off the combo game 1, they'll want to do that. In comes the totem and that removal they've just brought in becomes useless and our combo becomes more consistent, just with less bodies. Also super useful against any graveyard strategies our opponent is going for so it's super strong against Golgari seeing as how they have a strong removal suite and will want to bring more of it in to deal with the clerics.
The 3x Settle the Wreckage are the secret MVPs of our sideboard. Because our deck plans to go longer into Fall of the Thran we have a hard time against decks like mono-green stompy which is way more explosive and boasts threats like Steel Leaf Champion that our tokens do nothing against. A well timed settle leaves them wide open to our go wide strategy and firmly puts us in control.
Shapers' Sanctuary is another very important bit of side board that will be coming in most game 2s as our opponent will be leaning heavily on removal post sideboard. That extra card draw allows us to pick out another threat anytime our opponent tries to deal with one on board.
Tocatli Honor Guard is the new spice people have found to play against Golgari decks to stop them going off with Wildgrowth Walker but it also works against Mono Red stopping their Viashino Pyromancers from burning our face and Izzet with their Crackling Drakes.
Conclave Cavalier is for the large amount of Jeskai and Creature-less Izzet control in my meta at the moment, if they clear the baord I'm still left with 2 bears, and Sorcerous Spyglass is for the planeswalkers that come with them (Teferi, Hero of Dominaria, Ral, Izzet Viceroy, either Vraska in Golgari.)
