It causes both creatures and nonbasic lands opponents play to enter the battlefield tapped, allows you to play an extra land every turn, and makes it so that you have to sacrifice a creature or land when it attacks, and then draws you a card
Midrange decks appreciate the extra surveiling to filter bad draws, like creature removal against control
There are 12 frame break cards1 uncommon, 5 rares, and 6 mythic rares
Rare cards are reproduced in Jolo specifications that the image of a commodity specification of the time
Surveil 2 is somewhat appreciated, so I would like to aim for it if I have the leeway, but since green dragons have land search as a precursor, the fact that it is likely to have disappeared from your hand is a slight negative
Here are examples of the variant in various documents