Some Rough Guidelines for how I would sideboard. It may seem like my boarded games against grindy matchups rely heavily on Lost Legacy. I'm hoping the synergies with Dwellers and Scourge justify this. If I don't draw it enough for it to really impact boarded games I'll have to start from scratch, because I'm just a bad version of B/G delirium if Dwellers don't do serious work.
Delirium: -1 Essence Extraction, -1 Incendiary Flow, -4 Harnessed Lightning. +4 Lost Legacy, +1 Ruinous Path, +1 Transgress the Mind. Basically I'm looking to out grind them and not lose to the Grapple/Spider/Emrakul attrition engine. Ideally I Lost Legacy Ish'kanah > Emrakul > Liliana but I might have to do Emmy first if they're close to casting her by the time I cast it. It could be naivete but I feel like this would be a pretty good game 2/3 if I can Legacy and Dweller it on 3 and 5. I don't think they have enough removal to warrant me bringing in the Scourge. There's also a chance I have to name Lost Legacy with my first one, in case Dark Dwellers pounded them G1.
W/U Flash: -2 Chandra, Torch of Defiance, -2 Kalitas, Traitor of Ghet, -2 Incendiary Flow, -1 Lost Legacy. +4 Galvanic Bombardment, +1 Essence Extraction, +2 Weaver of Lightning. Here I'm looking to just maximize on instant speed removal and ways to not die to Gideon while also taking out everything that's garbage against Queller. The only card advantage in their deck is like..clues? I plan on putting them into topdeck mode fairly quickly.
Vehicles: -3 Transgress the Mind, -2 Chandra, Torch of Defiance, -1 Ruinous Path, -1 Lost Legacy. +4 Galvanic Bombardment, +1 Essence Extraction, +2 Weaver of Lightning. Kill all their things, hope to put them in topdeck mode with an empty board. I think the top of my deck will generally be better than the top of theirs. Essence Extraction and Kalitas will keep me in the game. I plan on turning the lights off by flashing back an Extraction
Various Marvel/Aetherflux combo decks. Bring in all my copies of Lost Legacy and max out on Transgress. Just name Emrakul/Ish'kanah/Paradoxial Outcome/Crush of Tentacles and their life gets much harder.
Various Control Strategies: Board out my dead removal, bring in Transgress/Legacy/Scourge and start naming stuff like Gideon/Glimmer/Void Shatter while beating down with recurring 3/3's.
Black Eldrazi: tbd
GR energy pummeler/midrange: tbd
