Good idea, but that would require you to promote to Enchantment3. The free xp for heroes just BARELY covers Combat V, Twincast, and 3 spell sphere promos. So you'd need to go win a lot of battles with Hemah before you could get another 3 spell sphere promos.
The best part is you can do the summoning while marching on a city, so you don't need to wait outside it. Technically, all you need to win a game at that point is a couple guards to make sure he doesn't get assassin-zerged, and launch your attack
*imagines the look on someone's face after they lost a city to 108 water elementals in a single turn*
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