I like it. Easy to add to another game as a boon or a bane, perhaps for a character that is more susceptible to the Moon's influence. Perhaps a literal lunatic!
Here's a quick hack, print off 8 of these and number them from 1 to 8.
Stack into a deck facing down, shuffle and pull a card.
Then reference your preferred source on the 8 phases of the Moon for your oracle.
Here's an example source.
From here on in, it's easy to further hack and elaborate on this.
Thanks for the great concept!