Interesing - and baffling! - question from a Chaos Sealed side event, at GP LA.
Abbi casts
Polymorphous Rush, paying the Strive cost to target three of her creatures - let's say it's a Grizzly Bear, and two Ornithopters (because they're not that relevant).
When it resolves, she chooses Nick's best creature to copy - let's say it's a
Carnage Tyrant (for those following along at home, here's the first cool thing about P-Rush - the creature to be copied isn't targeted)(I *did* mention, this was Chaos!).
After all that, Abbi casts
Fated Infatuation, and targets her (not-quite)Grizzly Bear, which is now a copy of Nick's Carnage Tyrant. (With me so far? hang on, now it gets interesting…)
On Nick's turn, what is that token creature? A copy of Carnage Tyrant, still? or is it a copy of that Grizzly Bear?
I guess the question really is this: the 2nd copy effect is copying a copy effect with a duration (until end of turn); duration isn't listed as a copiable value, but copying a copy effect does copy that copy effect, which suggests it's also subject to the duration.
Great Minds didn't think alike, so curious minds want to know!
d:^D
P.S. - I did thank Abbi for the best rules question of the day!