Head Games 
Sorcery
$3.72 #14402 0.98 23.9 years
Target opponent puts the cards from their hand on top of their library. Search that player's library for that many cards. The player puts those cards into their hand, then shuffles.
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Cards similar to Head Games 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.
Chittering Rats92%
$0.19↓#18249↓0.06↓22.6 years↓
"When this creature enters, target opponent puts a card from their hand on top of their library."
Stunted Growth92%
$0.70↓#30785↓0.43↓31.3 years↑
"Target player chooses three cards from their hand and puts them on top of their library in any order."
Jester's Mask90%
$9.90↑#20203↓0.57↓31.3 years↑
"
, 
, Sacrifice this artifact: Target opponent puts the cards from their hand on top of their library. Search that player's library for that many cards. That player puts those cards into their hand, then shuffles."
, , Sacrifice this artifact: Target opponent puts the cards from their hand on top of their library. Search that player's library for that many cards. That player puts those cards into their hand, then shuffles."
Prying Questions90%
$0.10↓#30175↓0.05↓10.1 years↓
"Target opponent loses 3 life and puts a card from their hand on top of their library."
Painful Memories88%
$0.18↓#26979↓0.31↓29.9 years↑
"Look at target opponent's hand and choose a card from it. Put that card on top of that player's library."
Agonizing Memories88%
$0.16↓#27525↓0.20↓29.2 years↑
"Look at target player's hand and choose two cards from it. Put them on top of that player's library in any order."
Perish the Thought88%
$0.08↓#29493↓0.57↓16.4 years↓
"Target opponent reveals their hand. You choose a card from it. That player shuffles that card into their library."
Lost Hours86%
$0.05↓#30635↓0.00↓19.3 years↓
"Target player reveals their hand. You choose a nonland card from it. That player puts that card into their library third from the top."
Chimney Imp85%
$0.06↓#30193↓0.47↓22.9 years
"When this creature dies, target opponent puts a card from their hand on top of their library."
Sadistic Augermage81%
$0.05↓#30038↓0.25↓20.9 years↓
"When this creature dies, each player puts a card from their hand on top of their library."
Volrath's Dungeon77%
$0.29↓#25093↓0.39↓28.2 years↑
"Discard a card: Target player puts a card from their hand on top of their library. Activate only as a sorcery."
Psychotic Episode72%
$0.09↓#167840.20↓19.9 years↓
"Target player reveals their hand and the top card of their library. You choose a card revealed this way. That player puts the chosen card on the bottom of their library."
Widespread Panic72%
$0.29↓#23801↓0.35↓12.8 years↓
"Whenever a spell or ability causes its controller to shuffle their library, that player puts a card from their hand on top of their library."
Vendilion Clique70%
$3.53↓#7056↑0.33↓18.6 years↓
"When this card enters, look at target player's hand. You may choose a nonland card from it. If you do, that player reveals the chosen card, puts it on the bottom of their library, then draws a card."