Sakashima of a Thousand Faces

If the chosen creature is copying something else, then Sakashima enters the battlefield as whatever the chosen creature copied.

Sakashima of a Thousand Faces copies exactly what was printed on the original creature (unless that creature is copying something else or is a token; see below), except that it also has Sakashima's other abilities. It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or any Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on. Most notably, if it copies a creature that's not normally a creature, it won't be a creature.

If you control more than one legendary permanent with the same name and the "legend rule" begins applying again (perhaps because Sakashima of a Thousand Faces leaves the battlefield), you'll immediately have to comply with the rule and put all but one of those permanents into the graveyard.