Prayer for Readiness
You utter a powerful prayer upon your comrades, giving each a special blessing. At any point later this battle, each blessed ally can acknowledge the blessing by saying 'thank you' to your god, gods, or pantheon as a free action to reroll a d20 roll. That ally must take the reroll result.
Note that you are giving the blessing and don't receive it yourself.
This spell is now a quick action to cast.