A grade 9 Master Scroll sold on eBay for somewhere in the ballpark of $50,000 (40,000) (though it was an accepted offer, so we can't be sure of an exact price)
This can be particularly useful if you keep getting blocked by small, disposable creatures, or if your army is struggling to get past your opponent's defences
You can obtain the Mega Slowbro ex (2-Star Shiny rarity) card by opening Mega Shine from Mega Shine set
It's not a "may" effect so you have to blow up something, but it also doesn't count mana rocks, so one will lose their Sol Ring or Arcane Signet
If they are holding removal or countermagic you can take that away, see what other options they have and then do your own thing with perfect information and safety
Because theyre digital, theyre not physical cards at all, theyre just a digital design that fills the card space