Disney and Ravensburger have kept many of the details close to the vest, but enough details have leaked that we have a solid idea of what to expect and this next set is going to be a doozy

1x Art card Art cards are foil stamped in 5% of packs 1x Traditional foil double- or single-faced card Showcase, borderless, or any other Innistrad: Crimson Vow card of any rarity 2x Double- or single-faced cards Can be a showcase card of any rarity, a borderless rare or mythic rare, an Innistrad: Crimson Vow Commander rare or mythic rare, or any common or uncommon 1x Double- or single-faced rare or mythic rare 2x Double- or single-faced commons or uncommons Can be a double-faced showcase, single-faced showcase, or any Innistrad: Crimson Vow double-faced common or uncommon 2x Single-faced uncommons 3x Single-faced commons 1x Eternal night full-art basic land Eternal night basic land is traditional foil in 15% of packs 1x Token, ad card, helper card, or card from The List DRAFT BOOSTERS Draft Boosters are optimized for drafting Magic

Pepa Madrigal - Weather Maker helps against decks that rely on just one or a few Lore-generating characters, for example those that focus on Tamatoa - So Shiny
Some folks have argued that its a little too much like Upheaval in that the caster gets to float mana and do additional things (especially since the lands enter the battlefield untapped), but that analogy breaks down because the opponents also get to float mana and have untapped lands
The cost reduction applies only to generic mana in the total cost of Aura and Equipment spells you cast
And well, thats accurate, but this commander still has a place, specifically because it lacks Chatterfangs prestige