In a figurative sense, the story makes a lot of sense. The fact that you make rain and have power over the weather is a strong fantasy in a dream. For me such dreams of omnipotence indicate that one should never underestimate one's own potential in waking life.

If something is genuine and if you want to make something true without selfish desires, it usually happens that the universe gives it to you. Hence the saying: "Think which spirits you call. They might come."

This fairy-tale exaggeration is therefore necessary so that we can now and then metaphorically consider the normality in which our desires are fulfilled.

Mostly, we ask for something and then totally forget about it. When life then presents what one has asked for, surprise comes on foot. But it shouldn't ;-)

A very round thing. Thank you very much for the good entertainment.

P.S. I really like the way you symbolically integrated the horse into the narrative.