The Seven of Cups is a card of options, daydreaming, procrastination and scattered energies. The High Priestess is the female principle, passive, secretive and receptive. She symbolizes hidden knowledge, mysteries, intuition and is associated with the Moon and its phases. The combination of the Sevn of Cups and the High Priestess shows energies that are unclear and ambiguous, often on purpose.
To understand the elemental relationships between the cards, we should always take into account their actual meaning. The elements of the cards are Water (Seven of Cups) and Water (High Priestess). The elements are neutral and friendly to each other, but too much water can lead to passivity or inertia. The Seven of Cups and the High Priestess can give great intuitive insights, but too much water can cause confusion or lack of energy.