As far as being worth it, booster boxes follow the rule that buying in bulk is more efficient than buying single packs over the course of a longer period of time
Top 10 Red ETB Creatures (Norin, Swift SurvivalistNorin, Swift Survivalist | Art by Yigit Koroglu) Run, Norin, Run
Also remember that I tend to settle in at a mid- or battlecruiser-level of play, which will affect how I evaluate cards
The risk with mana rocks is that your opponents can take out your resources with cards like Abrade or Culling Ritual, but The Soul Stone survives them all
First up are Dazzling SphinxDazzling Sphinx, Thief of SanityThief of Sanity, Nashi, Moon Sages ScionNashi, Moon Sages Scion, and Fallen ShinobiFallen Shinobi, which all snatch stuff from the top of libraries for you to cast from exile when they deal combat damage
Whether you look for a flare as a free spell, a fetch land, or a feline (namely Ocelot Pride), you could land on a great boost for your Modern deck