Axel versus Laslo.

Antimagic only affects its own stacks, so that option is out. In general, it's best to equip yourself with everything possible to increase initiative. You can take Readiness and stay on the defensive, and if he immediately uses Paladins, use a hero with high intelligence to speed up everyone so that the archers move before the enemy and eliminate them. Then, stay on the defensive while his infantry advances. And then attack when the right moment comes. You can disrupt their retaliation with Phantom or a nearly depleted stack of someone. And then keep attacking until they are defeated.