In the Eye of Chaos | Magic: The Gathering
Formats In the Eye of Chaos is Legal in
Official Oracle Text for In the Eye of Chaos
Official Rulings for In the Eye of Chaos
10/1/2008 : This has the supertype world. When a world permanent enters the battlefield, any world permanents that were already on the battlefield are put into their owners' graveyards. This is a state-based action called the "world rule." The new world permanent stays on the battlefield. If two world permanents enter the battlefield at the same time, they're both put into their owners' graveyards.