I like what your doing here! Great start.

Just a random thought for the Luck Domain.

Least - Regular luck power at 1/day
Lesser - 2/day
Greater - 3/day and may now use an immediate action to grant it to an ally you can see
High - 4/day
Divine - 5/day and may use an immediate action to force an opponent to reroll.

In any case, if you use the ability in any fashion, you may not use it again until your next turn.

Dunno just something that immediately sprung to mind.