Mirrorweave | Magic: The Gathering
Formats Mirrorweave is Legal in
Official Oracle Text for Mirrorweave
—Bowen, Barrenton guardcaptain
Official Rulings for Mirrorweave
5/1/2008 : If the targeted creature is itself copying a creature, each other creature will become whatever it's copying, as modified by that copy effect. For example, if you target a Cemetery Puca that's copying a Grizzly Bears (a 2/2 creature with no abilities), each other creature will become a Grizzly Bears with the Cemetery Puca ability.
5/1/2008 : This effect can cause each other creature to stop being a creature. For example, if you target an animated Mutavault (a land with an activated ability that turns it into a creature), only the printed wording will be copied -- the "becomes a creature" effect won't. Each other creature will become an unanimated Mutavault.
5/1/2008 : Noncopy effects that have already applied to the other creatures will continue to apply to them. For example, if Giant Growth had given one of them +3/+3 earlier in the turn, then Mirrorweave made it a copy of Grizzly Bears, it will be a 5/5 Grizzly Bears.
5/1/2008 : If the targeted creature is a token, each other creature copies the original characteristics of that token as stated by the effect that put it onto the battlefield. Those creatures don't become tokens.
5/1/2008 : As the turn ends, the other creatures revert to what they were before. If two Mirrorweaves are cast on the same turn, they'll both wear off at the same time.