I do believe others playing Ramunap Red will also consider the mirror match when it comes to how they design their decks, which makes me believe we will see more copies of Chandras Defeat, Pia Nalaar, and Aethersphere Harvester in sideboards
Paired with Ruby Medallion, it effectively gives extra copies of reducers, so its easier to chain rituals and finish with Past in Flames, Wish, Grapeshot, or Empty the Warrens
When it resolves, you get to pick an opponent and dig through their library until you find a creature you want and you put that card directly into play on the battlefield under your control
Then for chapters two and three, you get to double the number of each type of counter on a creature you control
These variants can be found in Draft, Set, and Collector Boosters, while some of the uncommon showcase cards can be found in Theme Boosters
You know, the turn you give your board buffs to swing out