If Magus of the Moon loses its abilities, it continues to turn nonbasic lands into Mountains. This is because effects that change subtypes are applied before considering effects that remove abilities, regardless of the order in which those effects started.
Magus of the Moon doesn't affect names or supertypes. It won't turn any land into a basic land or remove the legendary supertype from a legendary land, and the lands won't be named "Mountain."
If a nonbasic land has an ability that causes it to enter the battlefield tapped, it will lose that ability before it can apply. The same is also true of any other abilities that modify how a land enters the battlefield or apply "as" a land enters the battlefield, such as that of Vesuva or Cavern of Souls.
Last observed on Scryfall 2 months ago at $13.32. Over the trailing 90 days the price moved between $2.09 and $14.26 across 57 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 3 catalogued treatments from IMA — the lineup includes Foil and Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #138 of *Iconic Masters*, the set that shipped alongside the November 2017 Iconic Masters release.
Card type: Creature — Human Wizard, color identity red, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {2}{R} (3 converted).
Legal across the major constructed formats — Modern, Legacy, Vintage, and Commander — plus Standard rotation play.
EDHrec ranks this card #3,075 in Commander, putting it in the niche-pick tier of the format's playable pool.
Illustrated by Franz Vohwinkel. Rarix catalogs 555 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Franz Vohwinkel
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
If a nonbasic land has an ability that triggers "when" it enters the battlefield, it will lose that ability before it can trigger.
Nonbasic lands lose any other land types and abilities they had. They gain the land type Mountain and gain the ability "{T}: Add {R}."
