Being able to cast spells from the top of your library is already like getting to draw free cards, and flashing fliers in at the end of an opponents turn (assuming they have both Flying and Flash) is like giving your fliers haste, as theyll be allowed to attack on your upcoming turn
As a green creature, it can be very powerful, especially with lands-matter commanders or landfall commanders that run a higher-than-average number of lands
Magus of the Moons flavor text, credited as a Numbers station transmission, alludes to shortwave radio numbers stations, generally believed to be in use as part of spycraft, but also a feature of the paranoid and conspiratorial side of horror
This generally works best with massive creatures like Yargle and Multani and Ghalta, Primal Hunger, though decks interested in filling the graveyard dont necessarily need this green enchantment to be card-positive