You can Fork this spell for another slate of card drawing fun times by sacrificing a dork with a power of at least three, quite easily in Black in casual town
They are primarily three-color decks, except for Growing Threat, which only uses two colors
Based on only the rares and mythics we know, and assuming that all the uncommons and unknown rares are literally worthless, the pack EV currently comes out to a little under $12
While Falling Star doesn't see much play anymore as a result (most of the time Lightning Bolt is just better anyway), Chaos Orb has become the most iconic and representative card of Old School Magic
A faster aggro deck may only need around 5 rocks, while a ramp deck aiming to play big creatures likely wants over 10 rocks
There may be some decks that take advantage of Phoenix Downs recursion to put key creatures on the battlefield