If you wanted to improve the old DI ability without a complete change out, the simplest change would be to remove the action cost. Just make it a free action.
That way when it doesn't work (the vast majority of the time), then its no harm no foul. And a cleric in an intense situation never feels like he has to choose between an action that might not work but still does something to help, or an action with a 10% chance to save the day.
That way when it doesn't work (the vast majority of the time), then its no harm no foul. And a cleric in an intense situation never feels like he has to choose between an action that might not work but still does something to help, or an action with a 10% chance to save the day.