1. Get 4 piece T8 bonus on your druid
2. Get Harold's Rejuvenating Broach
3. Get a makro like:
/equip {insert Idol here} /equip Harold's Rejuvenating Broach
4. Spamm that makro and enjoy your free Rejuvenation heals! You won't lose mana!
It also "stacks" with a normal Rejuvenation!