Supric
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Other options were also suggested. For example, the ability could only work for the first three turns.
With mana regeneration for each killed unit, you could make the amount of mana restored dependent on the HP taken by the last attack.
In a tournament, with Necromancer heroes banned for the initial clearing of the map, people switched to Sanctuary mages with Kappa and Priestesses. They also clear the map quite well.
