MSRP vs Market Reality Both product types retail around 5,400-5,500 ($36-37)
This seems to provide some quick delineation of which cards are affected and which aren't that's relatively simple to implement in a game with lots of numbers
Gemstone Mine is unique in that it has a limited number of taps due to relying on mining counters that reduce every time it is tapped, it enters with three counters and gives one mana of any color when tapped
Affinity becomes too powerful an ability when you get to count most of your lands, as do Arcbound Ravager and Disciple of the Vault, and there are also older effects like Goblin Welder that can make the situation even worse
Be realistic and be friendly, because that person will likely take more than one of your damaged cards
They can be flashed back with Snapcaster Mage or Lier, Disciple of the Drowned, or returned to your hand via Archaeomancer