Geth's Grimoire 
Artifact — Book
$8.54 #2318 0.54 22.6 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%
$0.43↓#13218↓0.612.4 years↓
"Whenever one or more players discard one or more cards, investigate. This ability triggers only once each turn."
Waste Not83%
$5.51↓#1241↑0.91↑12.1 years↓
"Whenever an opponent discards a noncreature, nonland card, draw a card."
Liliana's Caress82%
$5.31↓#24120.5116.1 years↓
"Whenever an opponent discards a card, that player loses 2 life."
Sangromancer81%
$0.69↓#20020.35↓15.6 years↓
"Whenever an opponent discards a card, you may gain 3 life."
Confessor80%
$0.20↓#19169↓0.43↓24.9 years↑
"Whenever a player discards a card, you may gain 1 life."
Fell Specter79%
$0.34↓#4878↓0.41↓8.1 years↓
"Whenever an opponent discards a card, that player loses 2 life."
Nath of the Gilt-Leaf78%
$3.01↓#12831↓0.40↓18.9 years↓
"Whenever an opponent discards a card, you may create a 1/1 green Elf Warrior creature token."
Megrim77%
$1.01↓#25860.5528.5 years↑
"Whenever an opponent discards a card, this enchantment deals 2 damage to that player."
Aclazotz, Deepest Betrayal // Temple of the Dead76%
$8.42↓#25430.71↑2.8 years↓
"Whenever this card attacks, each opponent discards a card. For each opponent who can't, you draw a card."
Tinybones, Trinket Thief76%
$4.28↓#5111↓1.10↑6.1 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 Cantor74%
$0.47↓#6178↓0.565.3 years↓
"Whenever an opponent discards a card, put a +1/+1 counter on this card."
Dimir Cutpurse72%
$0.43↓#15610↓0.5220.9 years↓
"Whenever this creature deals combat damage to a player, that player discards a card and you draw a card."
Raiders' Wake72%
$0.48↓#5293↓0.29↓8.9 years↓
"Whenever an opponent discards a card, that player loses 2 life."
Spiritual Focus72%
$6.48↓#29347↓0.22↓26.9 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."
Abyssal Nocturnus72%
$0.68↓#20128↓0.27↓20.6 years↓
"Whenever an opponent discards a card, this creature gets +2/+2 and gains fear until end of turn."
Spirit Cairn71%
$0.12↓#20981↓0.00↓24.3 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%
$1.69↓#10408↓0.29↓16.6 years↓
"Whenever an opponent discards a card, you may put a quest counter on this enchantment."
Four Knocks70%
$0.77↓#8802↓0.67↑2.9 years↓
"At the beginning of your first main phase, draw a card."