Unearthed Arcana: Warlock & Wizard includes the eldritch invocation Green Lord's Gift for warlocks, which reads:
Green Lord’s Gift
Prerequisite: The Archfey patron
The Green Lord oversees a verdant realm of everlasting summer. Your soul is linked to his power. Whenever you regain hit points, you treat any dice rolled to determine the hit points you regain as having rolled their maximum value.
If I take this invocation, does it only benefit healing from resting and potions, or would healing spells also be maximized? For example, my Warlock is multi-classing as a Cleric, so I have healing word. If I cast healing word on myself, would the roll effectively be (4 x spell level) + modifier?