[Bat/man]

Water Oracles:

Generally oracles are expensive. But if you need to hit a research target by a certain turn, the research boost can be situationally useful.

If you start near water, and have no nearby water powers, being fully amphibious allows agartha access to uncontested indies.

If you plan to go the water route, the water path on these oracles is more useful than it would be on land. Likewise water forging.

Finally, I'm going from memory. But my memory says that water oracles have one higher defense than death (due to magic path). And again, from memory, are at least occassionally not old age.