There was, in fact, a Wizard Garden in the Dream Wilderness. It was called Tidewave Garden, and it came from Lord Rhein.
Rhein had originally suggested bringing Tidewave Garden into the Dream Wilderness in order to test what would happen when the inherent laws of a Wizard Garden collided with the virtual laws of the Dream Wilderness.
The final result had been encouraging. The real laws within Tidewave Garden had been tamed by a subsidiary Authority beneath Celestial Change.
Within the Dream Wilderness, Tidewave Garden's laws had entered a state that was both virtual and real. This had accelerated the process by which the Authorities in the Dream Wilderness became laws.
It could be said that Rhein's test had been a complete success. This was a good thing.
However, the test had one prerequisite: the Authorities of the Dream Wilderness had to be able to suppress the real laws within the Wizard Garden.
Tidewave Garden was a small garden—or rather, a tiny one. The law veins within it were not particularly strong, and Celestial Change's subsidiary Authority alone had been enough to suppress them.
But if it were replaced with a medium-sized Wizard Garden of the same type, such as the Sea of Desire Garden of the Elysian Pure Land, then Celestial Change might not necessarily be able to suppress it.
If the stakes were raised further, and it was replaced by Deep Sea Song's large Wizard Garden, Deep Vortex Garden, then Celestial Change would not merely fail to suppress it—it would very likely suffer backlash from the Deep Vortex Law.
Thus, even the now-stable Dream Wilderness did not dare casually pull Wizard Gardens into itself. It had to carefully select small Wizard Gardens, and there also had to be corresponding Authorities capable of suppressing them. Let alone the Dream