If i have a magus of the moon and a prismatic omen in play are all lands mountains, or are they all land types

Question

If i have a magus of the moon and a prismatic omen in play are all lands mountains, or are they all land types

Answer 1

Magus of the Moon-Nonbasic lands are Mountains.

Prismatic Omen-Lands you control are every basic land type in addition to their other types.

That means that your lands are all basic land types.  They can tap for any color.  It overrides the Magus.  Though you opponent's nonbasic lands are mountains and will only produce red mana.