Gogo, Mysterious Mime
At the beginning of combat on your turn, you may have Gogo become a copy of another target creature you control until end of turn, except its name is Gogo, Mysterious Mime. If you do, Gogo and that creature each get +2/+0 and gain haste until end of turn and attack this turn if able.
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Official rulings (5) · Scryfall
If Gogo copies a legendary creature, Gogo will also be legendary, but because its name remains Gogo, Mysterious Mime, the "legend rule" won't cause either of them to be put into the graveyard.
If the copied creature is copying something else, then Gogo becomes a copy of whatever that creature is copying, with the listed exception.
If the copied creature is a token, Gogo copies the original characteristics of that token as stated by the effect that created the token, with the listed exception.
If the copied creature has {X} in its mana cost, X is 0.
Gogo copies exactly what was printed on the original creature, with the listed exception (unless that creature is copying something else or is a token; see below). It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or any Auras or Equipment attached to it, or any non-copy effects that have changed its types, color, power and toughness, and so on.