4 cards where the illustration contains “unseen-realm”

Frodo Baggins (The Lord of the Rings: Tales of Middle-earth #320)
Ringsight (The Lord of the Rings: Tales of Middle-earth #220)
Sanguine Bond (Tales of Middle-earth Commander #208)
Sauron, the Dark Lord (The Lord of the Rings: Tales of Middle-earth #329)

This search is finished. Now the real work can begin.