Sunfrill Imitator
Creature — Dinosaur
Whenever this creature attacks, you may have it become a copy of another target Dinosaur you control, except its name is Sunfrill Imitator and it has this ability.
With a flare of plumage and an earthshaking bellow, it can scare off predators three times its size.
Illustrated by
The Lost Caverns of Ixalan Commander#94RareEnglishLegality
Rulings
If the copied creature is a token, Sunfrill Imitator copies the original characteristics of that token as stated by the effect that created the token. Copying a token doesn't make Sunfrill Imitator a token. Similarly, if Sunfrill Imitator itself is a token, copying a nontoken permanent doesn't make it stop being a token.
Sunfrill Imitator copies exactly what was printed on the original creature, with the listed exceptions (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.
If the copied creature is copying something else, then Sunfrill Imitator becomes a copy of whatever that creature is copying.
If the copied creature has 
in its mana cost, X is 0.
If Sunfrill Imitator copies a legendary creature, Sunfrill Imitator will also be legendary, but because its name remains Sunfrill Imitator, the "legend rule" won't cause either of them to be put into the graveyard.