Knollspine Dragon 
Creature — Dragon
$0.38 #4503 0.24 18.5 years
Flying
When this creature enters, you may discard your hand and draw cards equal to the damage dealt to target opponent this turn.
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Cards similar to Knollspine Dragon 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.
Change of Fortune88%
$0.47↑#5677↓0.06↓4.9 years↓
"Discard your hand, then draw a card for each card you've discarded this turn."
Borrowed Knowledge87%
$0.20↓#12722↓0.06↓0.5 years↓
"• Discard your hand, then draw cards equal to the number of cards in target opponent's hand."
Book Devourer86%
$0.16↓#23888↓0.00↓8.0 years↓
"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."
Robber Fly82%
$0.32↓#28252↓0.3027.0 years↑
"Flying"
Avatar of Discord81%
$0.28↓#25346↓0.00↓20.5 years↑
"Flying"
Narset, Jeskai Waymaster80%
$0.21↓#12070↓0.211.5 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."
Tolarian Winds79%
$1.00↑#3114↑0.38↑28.0 years↑
"Discard all the cards in your hand, then draw that many cards."
Asmira, Holy Avenger79%
$1.21↑#24744↓0.13↓30.0 years↑
"Flying"
Jackdaw78%
$0.37↓#6924↓0.312.3 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."
Battlewing Mystic77%
$0.07↓#26883↓0.00↓4.1 years↓
"When this creature enters, if it was kicked, discard your hand, then draw two cards."
Shattered Perception77%
$0.28↓#13636↓0.06↓14.7 years↓
"Discard all the cards in your hand, then draw that many cards."
Bedlam Reveler76%
$0.20↓#14057↓0.1810.2 years↓
"When this creature enters, discard your hand, then draw three cards."
Forgotten Creation76%
$0.30↓#3476↑0.2010.5 years↓
"At the beginning of your upkeep, you may discard all the cards in your hand. If you do, draw that many cards."
Clive, Ifrit's Dominant // Ifrit, Warden of Inferno75%
$3.09↑#3312↑0.251.4 years↓
"When this card enters, you may discard your hand, then draw cards equal to your devotion to red."
Fugitive Codebreaker75%
$0.16↓#19278↓0.00↓2.7 years↓
"When this creature is turned face up, discard your hand, then draw three cards."
Umaro, Raging Yeti75%
$0.21↓#12429↓0.00↓1.4 years↓
"• Discard your hand, then draw four cards."
Phyrexian Dragon Engine74%
$1.10↑#8507↓0.00↓3.9 years↓
"When this creature enters from your graveyard, you may discard your hand. If you do, draw three cards."
Dangerous Wager74%
$0.12↓#15171↓0.00↓14.5 years↓
"Discard your hand, then draw two cards."
Malfegor74%
$0.47↑#14737↓0.56↑17.7 years
"Flying"
Markov Dreadknight74%
$0.15↓#23714↓0.06↓10.5 years↓
"Flying"