Who gets first priority to play action spells in combat?

Ruling: The attacker gets focus first in combat, which is required to play an action. After the attacker either passes or plays something (and it fully resolves), focus passes to the defender.

Sequence:

• Attacker receives focus first
• Attacker may pass or play an action
• If attacker plays something, it resolves fully, then focus passes to defender
• If attacker passes, focus passes to defender immediately
• Focus continues passing between players until both pass in succession