(Some of them would take up more room than we have in the text box by themselves, but you probably won't control that many lands.) In case you do end up with more than 31 lands, the remaining prime numbers below 100 are 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97
In the meantime, they can keep milling cards until you find one, or you could try milling your opponents with something like Psychic Corrosion to see if you can find a legendary among them
You can see these harbingers in the full-art lands of March of the Machine : These full-art basic lands can be found in Set and Draft Boosters in traditional foil and non-foil
In addition to an unrestrained desire for power and penchant for monologuing, they also tend to present our heroes with a terrible dilemma: a set of options which all seem bad with no obvious right answer
Check out CGC Cards' full guide on First Edition Pokmon cards here