Generally a deck is built around this card to allow for a high enough density of a keyword.
Divining Rod looks for battle skills as well as other skills, such as WarpWarp: You can play this from the top of your deck. and EchoEcho: Get an additional copy when drawn.. See the skills page for a full list.
Cards that say "Your units have..." generally only effect what's in play, and not cards in deck unless otherwise specified. Exceptions include: