10/4/2004: As a copy, the Clone copies all characteristics of the chosen creature. This includes name, color, power/toughness, abilities, and more. For example, a copy of an artifact creature is an artifact creature.
10/4/2004: Clone is not targeted, so it can copy an untargetable creature or a creature with Protection.
10/4/2004: If there is nothing to copy or you choose not to copy something, the Clone is 0/0 and will be put in the graveyard (unless something increases the toughness of your creatures).
10/1/2005: The Clone is not a Creature - Shapeshifter card in addition to the type of what it copies, it is only the copied creature's type.
7/15/2007: Clone doesn't copy whether the original creature is tapped or untapped. It also doesn't copy any counters on that creature, any Auras attached to that creature, or any effects that are currently affecting that creature -- you get exactly what's printed on the chosen card and nothing more. So if you copy an animated Chimeric Staff, for example, you get a normal, nonanimated Chimeric Staff.
7/15/2007: If the chosen creature is copying something else (for example, if the chosen creature is another Clone), then your Clone comes into play as whatever the chosen creature copied.
7/15/2007: If the chosen creature is a token, your Clone copies the original characteristics of that token as stated by the effect that put it into play. Your Clone is not considered to be a token.
7/15/2007: Any comes-into-play abilities of the copied creature will trigger when Clone comes into play. Any "as comes into play" or "comes into play with" abilities of the chosen creature will also work.
Magic 2010
(Rare)