Klaus Fuchs, Atomic Spy

Whenever an opponent casts a noncreature
spell, they may pay {1}. If that player doesn't,
you create a resource token.
Sacrifice 6 clues: search your library for an
artifact card, reveal it, then put it into your
hand.

"There is nobody I know by name who is concerned with collecting information for the Russian authorities. There are people whom I know by sight whom I trusted with my life."