I noticed the amount of basics people played went down significantly the past few years, which makes sense if you look at the amount of lands we saw getting (re)printed
Modifications to the art that have been made outside of game effects (for example, signatures, your doodles, the occasional haiku) do not modify art
In addition, milling an opponent can often help some graveyard-based decks who might want their cards in their graveyards in the first place, or it may also help turn on the graveyard mechanics of their cards in play like Delirium
That leaves us with three cards, needing to discard one of them: Riparian Tiger, Exquisite Archangel, or Prey Upon
Expedition Map, Mind Stone, and Burnished Hart are just a few examples of Commander staples with different converted mana costs that can hit the graveyard
It's a key card in 16 combos