[Tuidjy]

1. Gift of Health. Best solution, but good luck keeping it before you kill off
the other nature nations.
2. The Chalice. Great solution, but good luck getting it. Problematic to keep
after people start wishing twice a turn.
4. Wished Arcoscephale priestesses. Expensive as Hell, and do not heal undead,
but great healers otherwise. Loyal, too.
3. Fairy Queens. Underwhelming as healers, expensive, and don't heal undead. On
the other hand, they are great mages, and can summon situationally useful stuff.
5. Other wished healers. May have their own stenghts, but significantly
inferior healers, when compared to a priestess.

In most cases, you are better off using the gems to go on the offense instead.
Of course, Tartarians and the Chalice and options 1/2 are the one of the best
ways to go on the offense.