Lich Priest trait doesn't activate

Death Class Lich Priest trait Unholy Prayer states:

“At the start of battle, your creatures gain Murder of Crows.”

However when starting a battle, no buff called Murder of Crows is applied.

It’s a Spell Gem - is that appearing in your list of spells correctly?

Ah, yes it is!

Is that what the icon beside it means?

Yep! That’s a death spell gem icon.