When Udyr's ability refers to 'one you've not chosen this turn,' does this memory persist across multiple copies of Udyr or when Udyr changes zones?

Ruling: Each Udyr is a separate entity with its own memory of choices. If Udyr leaves play and re-enters, it becomes a new entity and does not remember previous choices.

Sequence:

• Multiple Udyrs on the battlefield track their choices independently
• When Udyr changes zones (bounced and replayed), all temporary modifications cease to be tracked
• The returned Udyr is treated as a new entity with no memory of prior choices

Nuances:

• The comprehensive rules lack specific rules about modal abilities in general, so this interpretation is based on the zone change rules that clear temporary tracking