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An activated mana ability is one that adds mana to a player’s mana pool as it resolves, doesn’t have a target, and isn’t a loyalty ability. A triggered mana ability is one that adds mana to a player’s mana pool and triggers on an activated mana ability.
If the copied creature is a token, the token that’s created copies the original characteristics of that token as stated by the effect that created the token.
Triggered abilities use the word “when,” “whenever,” or “at.” They’re often written as “[Trigger condition], [effect].” Some keyword abilities, such as afterlife, are triggered abilities and will have “when,” “whenever,” or “at” in their reminder text.
If the copied creature is copying something else (for example, if the copied creature is a Mirror Image), then the token enters the battlefield as whatever that creature copied.
If you counter a delayed triggered ability that triggered at the beginning of the “next” occurrence of a specified step or phase, that ability won’t trigger again the following time that phase or step occurs.
Abilities that create replacement effects, such as a permanent entering the battlefield tapped or with counters on it, can’t be targeted. Abilities that apply “as [this creature] enters the battlefield” are also replacement effects and can’t be targeted.
Activated abilities are written in the form “[Cost]: [Effect].” Some keyword abilities, such as equip, are activated abilities and will have colons in their reminder texts.
Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any “as [this creature] enters the battlefield” or “[this creature] enters the battlefield with” abilities of the chosen creature will also work.
The token copies exactly what was printed on the original creature and nothing else (unless that creature is copying something else or is a token; see below). 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, or so on.
If the copied creature has in its mana cost, X is considered to be 0.