A noncreature permanent that turns into a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.
Although Mutavault has all creature types while it's animated, it does not have the changeling keyword ability.
This printing is one of 2 catalogued treatments from PRM — the lineup includes Full Art 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 #31425 of *Magic Online Promos*, the promotional run that shipped alongside the November 2010 Magic Online release.
Card type: Land, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters.
Legal across the major constructed formats — Modern, Legacy, Vintage, and Commander — plus Standard rotation play.
EDHrec ranks this card #1,893 in Commander, putting it in the common-include tier of the format's playable pool.
Illustrated by Fred Fields. Rarix catalogs 102 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Fred Fields
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
