Counter-heroes in duel mode (3.1).

Of course, I would unleash a barrage when the mages were split into groups of 20 or 30, plus Titans in the enchanted units. If there are 58 and separate single units, it's already pointless. Also, it's important that the druids open the channel before Dira's turn. If 4 spheres are used in the first turn, then theoretically 35 mana remains, and you can even summon a Phoenix in the next turn, but usually it's not necessary, and you just finish off the remaining units with the swarm. This isn't relying on the opponent being too foolish – not everyone knows this strategy; almost all average players on Heroes split their mages.