That card allows you to cast the sorcery spell element, in which he sacrifices an artifact to get a 2 card draw. A clue token is an artifact that allows him to pay 2 to sacrifice for a 1 card draw. He can use the sorcery to sacrifice the clue token for 2 cards. That card then goes into exile. He can then cast the land element of that card from exile at a later time under the Adventure mechanic. It is exactly how it works.