Elkin Lair 

World Enchantment
$1.22 #21086 0.59 29.6 years
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.
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Cards similar to Elkin Lair expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Suppress78%
$0.33↓#27675↓0.44↓25.3 years↓
"Target player exiles all cards from their hand face down. At the beginning of the end step of that player's next turn, that player returns those cards to their hand."
Skullcap Snail70%
$0.20↓#181690.06↓2.8 years↓
"When this creature enters, target opponent exiles a card from their hand."