If an artifact is no longer useful for whatever reason, like Ichor Wellspring or Solemn Simulacrum thats just hanging around, it can be sacrificed for mana and whatever extra effect it has
Obviously, in Commander, a high life total isnt the do all and end all, since commander damage can still kill you (ask me sometime about getting killed by Zedruu the Greathearted while at 2500+ life), but for the most part, gaining life makes you that much more difficult to kill
Expose the Culprit defends your creatures from removal while also getting you access to the cards that offer big value on flip, like Unyielding Gatekeeper or even Dog Walker
Slightly easier to answer but no less daunting, the number of unique cards, where you only consider the first printing of each card, brings your total up to a huge 36,108 cards
Show the front and the back: the back reveals centering and edge wear that the front hides
Among collectors, the real appeal of newer Pokmon sets is in the variants and alternate art cards
