I'd buy packs, hoping to get the rarest "shinies," or holographic cards
Modern sets contain highly valuable cards including Alt Art cards, Rainbow Rares, Gold cards, and Trainer Gallery cards
Altar of Bhaal Amethyst Dragon Animating Faerie Aquatic Alchemist Ardenvale Tactician Beanstalk Giant Beanstalk Wurm Bellowing Bruiser Beluna Grandsquall Beluna's Gatekeeper Besotted Knight Blessed Hippogriff Bonecrusher Giant Bramble Familiar Brazen Borrower Brightcap Badger Callous Sell-Sword Candlekeep Inspiration Chancellor of Tales Cheeky House-Mouse Colossal Badger Conceited Witch Cruel Somnophage Crystal Dragon Curious Pair Decadent Dragon Devouring Sugarmaw Dread Linnorm Edgewall Inn Edgewall Innkeeper Elusive Otter Embereth Shieldbreaker Emerald Dragon Ettercap Fae of Wishes Faerie Guidemother Fang Dragon Fell Horseman
The Pokemon TCG featured some valuable sets during the X&Y era, with Roaring Skies making its mark as one of the top dogs
Modern Magic revolves around enters-the-battlefield abilities, so it makes sense that doubling those triggers is worth your time, even if the set-up cost is pretty high to get this 4-mana do-nothing rolling
I have decided to break each color of commons down to four categories to make the content easy to digest