Before battle resolution destroys the army opposing the winner's army: It does not destroy that army, and the winner may choose and destroy one unit in that army.
Battle:
If there are no Terrains at the current battlefield: Put this card into play there.
"Gripping the bloody wakizashi, the ronin fled to the empty Phoenix lands. He could not have known what he would find there, or what destiny Ambition would bring." - from The Last Days of the Emperor, vol. II