Unless adrenaline staff only heal once, no buff needed.
Unupped 1 round of attacks:
20 healed 12 dealt
Upgraded 1 round of attacks:
15 healed 9 dealt
Unupped - Upped
Diamond Shield: 20 healing - 15 healing 1 damage
Skull Shield (1/14 prob): 5 healing 2 damage - 5 healing 3 damage
Procrastination: 20 healing 6 damage - 15 healing 4.5 damage
Unless you are referring to the 1/14 chance that Skull Shield works on the first attack, upgrading Druidic in a Adrenastaves deck is foolish.