Trying a diffferent way to handle Clerics and Druids

One of the things I think of most often when it comes to handling Clerics and Druids is that as part of their class, they have an obligation to a higher authority for the use of their powers.  I've never really been thrilled with the BtB handling based on how the Player RP's the character.  Too much room for interpretation.

Here's something we are trying with some interest and success so far.

Clerics and Druids have a list of 4 tasks that is given at the creation of each new Cleric or Druid PC.  Essentially, these are the things the deity expects their devotee to do daily to stay in the deity's good graces.  the DM and Player can come up with any 4 tasks they like based on the deity, the alignment of the PC and deity, etc...

What it boils down to is that as long as the PC performs the 4 tasks as expected the day before, they are in the deity's "Best" graces and their spells automatically work as expected to maximum effect.

If the Cleric/Druid in question only performs 3/4 tasks then they have a 15% chance of spell failure and the spells that do work do so in the expected manner as randomly rolled for results as usual.

If the Cleric/Druid in question only performs 2/4 tasks then they have a 30% chance of spell failure and the spells that do work do so in the expected manner as randomly rolled for results as usual.

If the Cleric/Druid in question only performs 1/4 tasks then they have a 45% chance of spell failure and the spells that do work do so in the expected manner as randomly rolled for results as usual.

If the Cleric/Druid in question performs none of the tasks then they have an 60% chance of spell failure and they are in the deity's "Worst" graces and their spells work as expected to their minimum effect.

Clerics and Druids can use atonement much as they do BtB or immediately step up to their tasks and complete them es expected to get on the deity's good graces the next day.

I find as a DM that the tasks are easy to keep up with as the Player is required to announce when they are performing each task and if they do not then the DM assumes it did not happen and make a note of it.

This has really increased the roleplaying of Clerics and Druids in our game to make sure that they are earning the spells that they are given by their deity.

Try it out and let me know how of if it works at your table.