Book Devourer 
Creature — Beast
$0.16 #23888 0.00 8.0 years
Trample
Whenever this creature deals combat damage to a player, you may discard all the cards in your hand. If you do, draw that many cards.
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Cards similar to Book Devourer 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.
Forgotten Creation88%
$0.30↑#3476↑0.20↑10.5 years↑
"At the beginning of your upkeep, you may discard all the cards in your hand. If you do, draw that many cards."
Jackdaw88%
$0.37↑#6924↑0.31↑2.3 years↓
"Whenever this card deals combat damage to a player, you may discard your hand. If you do, draw a card for each artifact you control."
Knollspine Dragon86%
$0.38↑#4503↑0.24↑18.5 years↑
"When this creature enters, you may discard your hand and draw cards equal to the damage dealt to target opponent this turn."
Neheb, Dreadhorde Champion86%
$0.51↑#3970↑0.34↑7.5 years
"Whenever this card deals combat damage to a player or planeswalker, you may discard any number of cards. If you do, draw that many cards and add that much . Until end of turn, you don't lose this mana as steps and phases end."
. Until end of turn, you don't lose this mana as steps and phases end."
Astonishing Spider-Man86%
$0.92↑#18150↑0.31↑0.3 years↓
"Whenever this card attacks, you may discard your hand. If you do, draw a card for each card you've discarded this turn."
Tolarian Winds84%
$1.00↑#3114↑0.38↑28.0 years↑
"Discard all the cards in your hand, then draw that many cards."
Thought Gorger84%
$0.32↑#239920.11↑16.5 years↑
"Trample"
Narset, Jeskai Waymaster84%
$0.21↑#12070↑0.21↑1.5 years↓
"At the beginning of your end step, you may discard your hand. If you do, draw cards equal to the number of spells you've cast this turn."
Shattered Perception84%
$0.28↑#13636↑0.0614.7 years↑
"Discard all the cards in your hand, then draw that many cards."
Shocker83%
$1.03↑#221580.29↑29.0 years↑
"Whenever this creature deals damage to a player, that player discards all the cards in their hand, then draws that many cards."
Barbed Shocker83%
$0.24↑#18791↑0.56↑20.0 years↑
"Whenever this creature deals damage to a player, that player discards all the cards in their hand, then draws that many cards."
Decaying Time Loop83%
$0.41↑#7109↑0.003.0 years↓
"Discard all the cards in your hand, then draw that many cards."
Change of Fortune83%
$0.47↑#5677↑0.064.9 years↓
"Discard your hand, then draw a card for each card you've discarded this turn."
Byway Barterer82%
$0.25↑#11806↑0.002.2 years↓
"Whenever you expend 4, you may discard your hand. If you do, draw two cards."
Borrowed Knowledge81%
$0.20↑#12722↑0.060.5 years↓
"• Discard your hand, then draw cards equal to the number of cards in target opponent's hand."
Chandra, Flamecaller80%
$0.43↑#8876↑0.12↑10.7 years↑
"0: Discard all the cards in your hand, then draw that many cards plus one."
Ogre-Head Helm80%
$0.20↑#14836↑0.064.7 years↓
"Whenever this creature or equipped creature deals combat damage to a player, you may sacrifice it. If you do, discard your hand, then draw three cards."
Slate of Ancestry80%
$0.30↑#10241↑0.0624.0 years↑
"
, 
, Discard your hand: Draw a card for each creature you control."
, , Discard your hand: Draw a card for each creature you control."
Heartwarming Redemption80%
$0.25↑#12009↑0.057.5 years
"Discard all the cards in your hand, then draw that many cards plus one. You gain life equal to the number of cards in your hand."
Smellerbee, Rebel Fighter78%
$0.29↑#8015↑0.20↑0.9 years↓
"Whenever this card attacks, you may discard your hand. If you do, draw cards equal to the number of attacking creatures."