The Magician is a card of action, manifestation, individuality and creation. He is the master of personal Will, Intention and Magic. The Knight of Swords is logical, witty, just, but he can also be impatient, judgmental, ruthless and verbally aggressive. The combination of the Magician with the Knight of Swords describes a situation ruled by logic, personal will and control.
To understand the elemental relationships between the cards, we should always take into account their actual meanings. The elements of the cards in this case are Air (Magician) and Air (Knight of Swords). Two Air cards can generate quite a powerful and intense combination. In their negative expression, these two cards will bring feelings of restlessness, failure, futility. In most cases the strong air element in these two cards cards shows a dynamic situation that's subject to change.