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In the Commander variant, a double-faced card's color identity is determined by the mana costs and mana symbols in the rules text of both faces combined. If either face has a color indicator or basic land type, those are also considered. For example, Cecil, Dark Knight's color identity is black and white, since its front face is black and its back face has a white color indicator.

A nonmodal double-faced card enters with its front face up by default, unless a spell or ability instructs you to put it onto the battlefield transformed or allows you to cast it transformed, in which case it enters with its back face up.

If the copied enchantment is a token, the new token that's created copies the original characteristics of that token as stated by the effect that created the token.

If the enchantment copied by the token had any "when [this permanent] enters" abilities, the token also has those abilities, and they'll trigger when it's created. Similarly, any "as [this permanent] enters" or "[this permanent] enters with" abilities that the token has copied will also work.

If the copied enchantment is copying something else, then the token enters as whatever that enchantment copied.

Esper Terra's fourth chapter ability isn't a mana ability. It uses the stack and can be responded to.