One per 96 packs on average is a common estimate
Otherwise, you may need to complete your deck with cards you do have in your collection and simply finish crafting the deck as and when you can in Magic: The Gathering Arena
It ran in training mode for several weeks and finally, now that we have enough data, we released it in production
But if what you actually want is the vibe at the table, youve got more flexibility
That said, I could see running more for example, if your deck goes all-in on the commander, you could potentially run as many as 10 protective spells
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