Shimmering Efreet | Magic: The Gathering
Formats Shimmering Efreet is Legal in
Official Oracle Text for Shimmering Efreet
Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)
Whenever Shimmering Efreet phases in, target creature phases out. (It phases in before its controller untaps during his or her next untap step.)
—Naimah, Femeref philosopher
Official Rulings for Shimmering Efreet
10/4/2004 : If two of these phase in, they can both target the same creature and have just that one creature phase out.