Tempered in Solitude 

Enchantment
Whenever a creature you control attacks alone, exile the top card of your library. You may play that card this turn.
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Cards that do something similar 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.
Connecting the Dots 92%
$0.28#9758
"Whenever a creature you control attacks, exile the top card of your library face down."
Kami of Celebration 90%
$1.00#6590
"Whenever a modified creature you control attacks, exile the top card of your library. You may play that card this turn."
Caves of Chaos Adventurer 87%
$0.44#7374
"Whenever this creature attacks, exile the top card of your library. If you've completed a dungeon, you may play that card this turn without paying its mana cost. Otherwise, you may play that card this turn."
Synth Eradicator 86%
$0.32#8467
"Whenever this creature attacks, exile the top card of your library. You may get {E}{E} . If you don't, you may play that card this turn."
Robber of the Rich 85%
$1.52#10249
"Whenever this creature attacks, if defending player has more cards in hand than you, exile the top card of their library. During any turn you attacked with a Rogue, you may cast that card and you may spend mana as though it were mana of any color to cast that spell."
Gila Courser 85%
$0.17#15641
"Whenever this creature attacks while saddled, exile the top card of your library. Until the end of your next turn, you may play that card."
Laelia, the Blade Reforged 85%
$0.30#1297
"Whenever this card attacks, exile the top card of your library. You may play that card this turn."
Daredevil, Fearless Fighter 85%
$3.56#19255
"Whenever this card attacks, exile the top card of your library. this card deals damage to you equal to that card's mana value. You may play it this turn."
Bomat Courier 84%
$0.22#12903
"Whenever this creature attacks, exile the top card of your library face down."
Mezzio Mugger 84%
$0.32#12165
"Whenever this creature attacks, exile the top card of each player's library. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells."
Nathan Drake, Treasure Hunter 83%
$4.72#14996
"Whenever this card attacks, exile the top card of each player's library. You may cast a spell from among those cards."
Cunning Rhetoric 83%
$4.04#2592
"Whenever an opponent attacks you and/or one or more planeswalkers you control, exile the top card of that player's library. You may play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast it."
Etali, Primal Storm 82%
$0.43#260
"Whenever this card attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs."
Pick Up the Pace 82%
$0.41#28430
"Whenever a creature you control that entered this turn attacks, exile the top card of your library."
Nahiri, Forged in Fury 81%
$8.41#5136
"Whenever an equipped creature you control attacks, exile the top card of your library. You may play that card this turn. You may cast Equipment spells this way without paying their mana costs."