This slows your opponents down while not affecting you since it will be untapped for your upkeep, tapped for your opponents
If you want one of these unique beauties, youre going to have to pay up
Unlike Crested Sunmare and Ulvenwald Mysteries, the floor for Abandoned Sarcophagus and Spider Spawning is below the basement
It generates energy counters equal to the number of nonbasic lands an opponent controls when it comes into play, and then allows you to spend four energy to destroy a nonbasic land and make nonflying creatures unable to block each time it attacks
Replace it with something that reduces mana cost rather than eliminates it entirely, like As Foretold or Baral Chief of Compliance
Once Ive found this number, I write it down and move on to the next deck until I have a number written down for each deck I expect to face