Geth's Grimoire 
Artifact — Book
$8.38 #2317 0.49 22.7 years
Whenever an opponent discards a card, you may draw a card.
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Cards similar to Geth's Grimoire 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.
Hostile Investigator84%
$0.40↓#13325↓0.24↓2.5 years↓
"Whenever one or more players discard one or more cards, investigate. This ability triggers only once each turn."
Waste Not83%
$5.45↓#1256↑0.86↑12.3 years↓
"Whenever an opponent discards a noncreature, nonland card, draw a card."
Liliana's Caress82%
$5.10↓#24090.5916.3 years↓
"Whenever an opponent discards a card, that player loses 2 life."
Sangromancer81%
$0.76↓#20360.33↓15.7 years↓
"Whenever an opponent discards a card, you may gain 3 life."
Confessor80%
$0.22↓#18488↓0.21↓25.1 years↑
"Whenever a player discards a card, you may gain 1 life."
Fell Specter79%
$0.35↓#4911↓0.05↓8.3 years↓
"Whenever an opponent discards a card, that player loses 2 life."
Nath of the Gilt-Leaf78%
$3.10↓#13035↓0.61↑19.0 years↓
"Whenever an opponent discards a card, you may create a 1/1 green Elf Warrior creature token."
Megrim77%
$1.01↓#26020.4928.6 years↑
"Whenever an opponent discards a card, this enchantment deals 2 damage to that player."
Aclazotz, Deepest Betrayal // Temple of the Dead76%
$9.23↑#25910.75↑2.9 years↓
"Whenever this card attacks, each opponent discards a card. For each opponent who can't, you draw a card."
Tinybones, Trinket Thief76%
$4.19↓#5033↓0.70↑6.3 years↓
"At the beginning of each end step, if an opponent discarded a card this turn, you draw a card and you lose 1 life."
Tourach, Dread Cantor72%
$0.52↓#6170↓0.595.5 years↓
"Whenever an opponent discards a card, put a +1/+1 counter on this card."
Abyssal Nocturnus72%
$0.69↓#20298↓0.38↓20.7 years↓
"Whenever an opponent discards a card, this creature gets +2/+2 and gains fear until end of turn."
Dimir Cutpurse72%
$0.47↓#15834↓0.38↓21.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card and you draw a card."
Raiders' Wake72%
$0.46↓#5327↓0.20↓9.1 years↓
"Whenever an opponent discards a card, that player loses 2 life."
Spiritual Focus72%
$6.37↓#29538↓0.05↓27.0 years↑
"Whenever a spell or ability an opponent controls causes you to discard a card, you gain 2 life and you may draw a card."
Spirit Cairn71%
$0.16↓#21250↓0.31↓24.4 years↑
"Whenever a player discards a card, you may pay 
. If you do, create a 1/1 white Spirit creature token with flying."
. If you do, create a 1/1 white Spirit creature token with flying."
Quest for the Nihil Stone70%
$2.07↓#10499↓0.00↓16.7 years↓
"Whenever an opponent discards a card, you may put a quest counter on this enchantment."
Four Knocks70%
$1.00↓#9024↓0.19↓3.0 years↓
"At the beginning of your first main phase, draw a card."
Tinybones, Pocket Nuisance70%
$0.22↓#14303↓0.580.0 years↓
"Whenever a player discards one or more cards, this card deals 1 damage to each opponent."
The Haunt of Hightower70%
$1.79↓#7222↓0.597.7 years↓
"Whenever this card attacks, defending player discards a card."