yugioh cards slifer Enhancing the Sky Dragon's power in classic Yu-Gi-Oh and Extra Deck for a total of 70 sleeved cards YU-GI-OH! Slifer the Sky Dragon

History tracking: Keep a history of all your scanned cards and consult their value anytime

While Modern and Legacy players are theoretically so invested in the game that they won't quit based on a banning (especially when the banning improves the format), if someone buys their first Standard deck and it's suddenly banned, it's very possible that these players will give up on the game altogether

Oh wait, "this character gets -1 for each card in your opponents' hands"

Nassif saw something different, I'm assuming more of a "good stuff" concept, but I consider it reasonably well established that the idea turned out to be ill-conceived

We all know you have a box of just holo-stamped cards

Source: Pokmon/YouTube