Putting a card like Elesh Norn, Grand Cenobite into your graveyard and then bringing it to play with a card like Reanimate or Animate Dead makes for a powerful one-two punch, especially early in the game
If the top card is not a land, you'll still get a chance to see it, so that you get cool information, and if it sucks, you can shuffle with a Terramorphic Expanse
The absence of the legend restriction allows both copies to operate at full strength
Then all other cards are put on the bottom of their owners' libraries
There's a lovely tracker app for golden chocobos that is updated by some dedicated folks, but a few entries are considered found without photo evidence
Core Set 2021: Top 10 Standard Cards The Lists Note: since Core Set 2021 has a lot of reprints, we made a special rule for our top ten lists this time around