Progenitor Mimic | Magic: The Gathering
Formats Progenitor Mimic is Legal in
Official Oracle Text for Progenitor Mimic
Official Rulings for Progenitor Mimic
4/15/2013 : The original Progenitor Mimic will create tokens, but those token copies will not.
4/15/2013 : If you choose to have Progenitor Mimic enter the battlefield as a copy of a creature, the triggered ability it gains will become part of its copiable values. For example, suppose Progenitor Mimic enters the battlefield as a copy of Runeclaw Bear, a 2/2 green Bear creature with mana cost . The resulting object is a 2/2 green Bear creature named Runeclaw Bear with mana cost and with “At the beginning of your upkeep, if this creature isn't a token, put a token onto the battlefield that's a copy of this creature.” If another Progenitor Mimic enters the battlefield as a copy of that creature, it will be a Runeclaw Bear with two instances of the triggered ability.
4/15/2013 : If the chosen creature is a token, Progenitor Mimic copies the original characteristics of that token as stated by the effect that put it onto the battlefield. Copying a token doesn't make Progenitor Mimic become a token.
4/15/2013 : Any enters-the-battlefield abilities of the copied creature will trigger when Progenitor Mimic 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.
4/15/2013 : If the chosen creature has in its mana cost (such as Protean Hydra), X is considered to be zero.
4/15/2013 : If Progenitor Mimic somehow enters the battlefield at the same time as another creature, it can't become a copy of that creature. You may only choose a creature that's already on the battlefield.
4/15/2013 : You can choose not to copy anything. In that case, Progenitor Mimic enters the battlefield as a 0/0 Shapeshifter creature and is probably put into the graveyard immediately.