Rulings

• Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities of the copied creature will also work.2015-02-25
• The token creatures all enter the battlefield at the same time.2015-02-25
• A token that enters the battlefield as a copy of a face-down creature is a face-up colorless 2/2 creature with no name, abilities, or creature types.2015-02-25
• If the copied creature is a token, the token created by Clone Legion copies the original characteristics of that token as stated by the effect that put the token onto the battlefield.2015-02-25
• If the copied creature is copying something else, then the token enters the battlefield as whatever that creature copied.2015-02-25
• If the copied creature has {X} in its mana cost, X is considered to be zero.2015-02-25
• Each token copies exactly what was printed on the original creature and nothing else (unless that permanent 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, and so on.2015-02-25
• Remember that if you control more than one legendary permanent with the same name, you'll choose one to remain on the battlefield and put the rest into their owners' graveyards.2015-02-25