Elkin Lair

World Enchantment, 3R (4)
At the beginning of each player's upkeep, that player exiles a card at random from his or her hand. The player may play that card this turn. At the beginning of the next end step, if the player hasn't played the card, he or she puts it into his or her graveyard.¹
Illus. Jerry Tiritilli

Gatherer Card Rulings [Nov 2009]

• 2/1/2006: You can play the card this turn, not just during the resolution of the ability.
• 10/1/2008: This has the supertype world. This supertype is similar to legendary. The difference is that 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.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (1/6)	Visions (Rare)