Hi,
I was just looking over Mountains of the Phoenix and I was wondering if after playing the card, presence was necessary to use the effects. It uses the word "choose" rather than target, so I'm assuming there's no required targets for the action so if one side has one unit and one has zero, at Battle resolution, there should be nobody left. There's also no cost as far as I can tell, but the word "Then" in the last sentence is making me question it. Thanks for any help.
Relevant text: Mountains of the Phoenix Before this battle's resolution, the Attacker and the Defender each choose a unit in their own army; the active player decides who chooses first. Then, destroy the chosen units.