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Magus of the Moon's effect of turning all non-basics into Mountains isn't ending when it's put in the graveyard. Urza lands are unable to add the correct kind/amount of mana, only R.
I may be mistaken, but I believe the effect is supposed to end when Magus leaves play.

Game log is attached, see turn 6.

Thx.
Isochron already fixed this one after your report