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I tried using Clone on the Monsters in the first round, surrounding them with stacks of 1 Black Dragon each, so that the Ifrits would attack them.
In the second round, I cast Slow, skipping the attack from the Archdevils, and moved down and to the right, attacking the Spawn of Evil.
After that, unfortunately, I don't have any more ideas, because the enemy will use Sacrifice and revive the stack of Archdevils.