These can be basic land cards or other common cards
It also caters to a broader range of collectors - those who are happy to pull any special foiled card and those who will meticulously hunt for the absolute rarest "Iconic" treasures
Looking at Rev, Tithe Extractor closely, its no wonder that MTG players want to add her to their decks
Paying 2 life to have them come in untapped helps you to stay on curve, and in decks like Death's Shadow, that life loss is actually a bonus
Usually, cards go by one of a few select levels: Common Uncommon Rare Super Rare The Super Rare category typically has the shiny foil you should be looking for, though you can take a look at the lower-righthand side of the card to make sure
The difference between a grade 9 and a grade 10 can be tens of thousands of dollars, so a beat-up Base Set card from your attic isn't likely to be a winning lottery ticket