Hydra

The Hydra is a divine pet introduced during the Safari Harvest Event, and divine is the ceiling tier in Grow a Garden, so this is a pet built around top-end prestige rather than entry-level convenience. Anything sitting in the divine bracket is meant to anchor a late-game roster, not fill a starter slot.

Because the Hydra was tied to the Safari Harvest Event rather than a permanent egg rotation, its real obtain difficulty is about timing: you had to be active during that event to earn or hatch it, and once the window passed the only realistic route became player trading. Its own ability field is empty in the data, so I will not invent a multiplier here. Judge it the way you would any divine event pet, by its divine rarity and its event-limited availability, both of which keep demand high and supply thin.

On a serious team, a divine pet usually justifies its slot simply by being divine, since that tier tends to carry the strongest passives in the game. The honest caveat is that without a listed ability you should confirm the exact effect in-game before slotting it over a divine with a documented, repeatable farming buff.