Can Kai'sa's leader effect create a floating resource to cast a spell, or does it only work towards the recycle cost of a spell?

Ruling: Kai'sa's effect creates a resource that can only be used for the recycle cost of spells, not for casting spells normally or for units.

Nuances:

• The resource only works on spells, not units
• The resource cannot be used to cast spells from hand, only to pay recycle costs