Terra, Magical Adept

2025-06-06 Esper Terra's fourth chapter ability isn't a mana ability. It uses the stack and can be responded to.
2025-06-06 If the copied enchantment has {X} in its mana cost, X is 0.
2025-06-06 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.
2025-06-06 If the copied enchantment is copying something else, then the token enters as whatever that enchantment copied.
2025-06-06 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.
2025-06-06 The token copies exactly what was printed on the original enchantment (unless that enchantment is copying something else or is a token; see below). It doesn't copy whether that enchantment is tapped or untapped, whether it has any counters on it or any Auras or Equipment attached to it, or any non-copy effects that have changed its types, color, power and toughness, and so on.

mtg.wtf