Elkin Lair is a rare World Enchantment card from Visions (VIS), collector number 78. Current market price: $1.28, TCGplayer market prices via Scryfall.
At the beginning of each player's upkeep, that player exiles a card at random from their 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, they put it into their graveyard.