Single magic units are essential, firstly, because in this battle, they can attack first (removing retaliation), secondly, as correctly noted, they can destroy the crystal, thirdly, they consume the necessary mana, fourthly, they can cast an attack boost, which is quite good, and fifthly, they reduce defense, which is very good. And in general, 2 single magic units can kill 8 archers. If the opponent casts Rain or Fireball on them, you can rejoice in an easy victory.
Single magic units are essential, firstly, because in this battle, they can attack first (removing retaliation), secondly, as correctly noted, they can destroy the crystal, thirdly, they consume the necessary mana, fourthly, they can cast an attack boost, which is quite good, and fifthly, they reduce defense, which is very good. And in general, 2 single magic units can kill 8 archers. If the opponent casts Rain or Fireball on them, you can rejoice in an easy victory.