Given the success of the Pillar of the Paruns decks on Magic Online, Im extremely excited for this archetype, as I think Modern Horizons completely takes the deck to another level, and it gets to play a ton of really sweet cards in a really good toolbox.
The current system is more arbitrary, and a lot of Rule 0 talks end up in the controversial "My deck is a 7" statement, which doesn't help determine what decks can do, what their win cons are, and how power-crept a given deck truly is
Invasion of Ikoria and Finale of Devastation vied for the final slot too, but ultimately Chords flexibility in finding combo pieces or protection at Instant speed outweighs the overrun and recursion utility of these spells, at least when were talking about whats an essential tool in a players collection
Let's skim quickly on the front side
For the rest of our army, cheaper bodies are generally better but its also potentially worth overpaying for a creature with combat keywords or other impactful utility