Koi

The Koi is a limited mythical pet from the Zen Event, and what sets it apart is the acquisition path: instead of gambling on egg odds, you earned it deterministically from the Zen Shop after growing the Zen Channeller's tree four times. That is a refreshing change of pace — no RNG wall, just a grind gate. Anyone who committed to the event progression walked away with a guaranteed mythical, which is why so many active gardens still run one.

On a farming build the Koi fits the water-and-Zen theme, where pets typically reward steady, patient cultivation over burst harvesting. It rewards players who let the tree cycle run its full course rather than spamming quick crops.

Its mythical tier puts it a notch below the event divines but comfortably above the common filler pets. The real consideration now is scarcity: because the Zen Event has ended, the Koi can no longer be earned, so it carries collector weight on top of utility. Verdict: a solid, earned-not-gambled mythical that holds a team slot well during mid-game and trades respectably thanks to its closed acquisition window.