Muddle, the Ever-Changing

If the copied creature is a token, Muddle copies the original characteristics of that token as stated by the effect that created that token, with the stated exception.

The tokens created by a single instance of myriad all enter at the same time.

Each token copies exactly what was printed on the original creature and nothing else. It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.

Muddle's ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.

When Muddle becomes a copy of the target creature, it's neither entering nor leaving the battlefield. Any enters abilities or leaves-the-battlefield abilities won't trigger.

While Muddle is a copy of something else, it won't have its own triggered ability. However, if Muddle still has abilities on the stack waiting to resolve, they will do so. (It won't get multiple instances of myriad this way.)