Book Devourer 
Creature — Beast
$0.19 #23549 0.28 7.9 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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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.
Jackdaw88%
$0.39↑#6751↑0.80↑2.2 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."
Forgotten Creation88%
$0.22↑#3427↑0.15↓10.4 years↑
"At the beginning of your upkeep, you may discard all the cards in your hand. If you do, draw that many cards."
Knollspine Dragon86%
$0.38↑#4454↑0.15↓18.3 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%
$0.49↑#3921↑0.257.3 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%
$0.65↑#190850.00↓0.2 years↓
"Whenever this card attacks, you may discard your hand. If you do, draw a card for each card you've discarded this turn."
Shattered Perception84%
$0.28↑#13540↑0.2714.6 years↑
"Discard all the cards in your hand, then draw that many cards."
Tolarian Winds84%
$1.09↑#3157↑0.2427.9 years↑
"Discard all the cards in your hand, then draw that many cards."
Decaying Time Loop84%
$0.44↑#7081↑0.42↑2.9 years↓
"Discard all the cards in your hand, then draw that many cards."
Narset, Jeskai Waymaster84%
$0.25↑#12012↑0.231.4 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."
Barbed Shocker83%
$0.22↑#190490.2519.9 years↑
"Whenever this creature deals damage to a player, that player discards all the cards in their hand, then draws that many cards."
Shocker83%
$1.02↑#230030.2028.9 years↑
"Whenever this creature deals damage to a player, that player discards all the cards in their hand, then draws that many cards."
Change of Fortune82%
$0.43↑#5691↑0.334.8 years↓
"Discard your hand, then draw a card for each card you've discarded this turn."
Borrowed Knowledge82%
$0.20↑#13255↑0.00↓0.4 years↓
"• Discard your hand, then draw cards equal to the number of cards in target opponent's hand."
Byway Barterer82%
$0.31↑#11534↑0.212.1 years↓
"Whenever you expend 4, you may discard your hand. If you do, draw two cards."
Ogre-Head Helm80%
$0.24↑#14507↑0.294.5 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."
Chandra, Flamecaller80%
$0.46↑#8811↑0.3510.6 years↑
"0: Discard all the cards in your hand, then draw that many cards plus one."
Furyblade Vampire80%
$0.10↓#204280.2510.1 years↑
"Trample"
Heartwarming Redemption80%
$0.26↑#11722↑0.10↓7.3 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."
Slate of Ancestry80%
$0.32↑#10077↑0.2823.9 years↑
"
, 
, Discard your hand: Draw a card for each creature you control."
, , Discard your hand: Draw a card for each creature you control."
Smellerbee, Rebel Fighter79%
$0.30↑#8482↑0.00↓0.8 years↓
"Whenever this card attacks, you may discard your hand. If you do, draw cards equal to the number of attacking creatures."