Field intel
Field intel lets a Human lord look at a rival's army. The card files it among the lineage's spells, with a mana price and a turn to use, but that is only where the card keeps it. A Human lord cannot cast any spell, and no discovery lets them cast in secret under another name.
It shows one rival kingdom's army, and a kingdom's protections against scouting can turn it aside. The card prices it as research: the guild's labour of making the work again in each new world.