The benchmark for non-phasing board protection is Heroic Intervention (a green spell, much to white players chagrin)
Here, my primary concern isn't speculators or collectors but the poor college kid on Reddit trying to put together a Modern deck that ends up with fake Mox Opals off eBay, or the new player who thinks they are getting a good deal on some Modern staples to build their collection off Craigslist and hasn't played enough Magic to realize the cards are fake
There's a new king of 2-cost Rebels, and it's a soldier that's come back from the Magic game's distant past to revive the Rebel cause
Imp's Mischief is a Future Sight card I recently discovered and love dearly
You generally play less early creatures if your deck would rather cast Sol Ring, Arcane Signet, or Commander's Sphere to reach a higher cost card
This usually matters against Uro, who is large enough to shut down our offense single-handedly and who generates enough life to hurt long-term confidence in your Zenith Flare plan