Mockingbird

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

Any “enters” abilities of the copied creature will trigger when Mockingbird enters. Any “as [this creature] enters” or “[this creature] enters with” abilities of the copied creature will also work.

Mockingbird’s second ability counts all mana spent to cast Mockingbird, not just mana spent on {X}. If there are any additional costs to cast it, the mana spent to pay those costs counts as well.