Things have come a long way in the past 20 years, and you certainly dont need to destroy cards to tell if they are fake
Its a key threat in Izzet Cauldron and control decks, and in older formats, players use blink effects to make it a permanent threat
We'd have to watch the sold listings for a few more days/weeks to really determine if prices for the card going down in a substantial and prolonged way or if this is just a minor dip
However, in many cases, discover will be the better of the two
How to buy and sell Buying tips Compare market listings, check card condition, and prefer trusted sellers
And when the deed is done, we get a Food for each creature that survived