The Haunt of Hightower 
Legendary Creature — Vampire
$1.79 #7222 0.59 7.7 years
Flying, lifelink
Whenever The Haunt of Hightower attacks, defending player discards a card.
Whenever a card is put into an opponent's graveyard from anywhere, put a +1/+1 counter on The Haunt of Hightower.
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Cards similar to The Haunt of Hightower 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.
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"Whenever a card is put into an opponent's graveyard from anywhere, if this card is suspended, you may remove a time counter from this card."
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$0.46↓#5327↑0.20↓9.1 years↑
"At the beginning of your end step, if you attacked this turn, target opponent discards a card."
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$0.52↓#61700.595.5 years↓
"Whenever an opponent discards a card, put a +1/+1 counter on this card."
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$0.13↓#14625↓0.00↓14.5 years↑
"Flying, lifelink"
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"Flying, lifelink"
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$0.06↓#27403↓0.11↓13.1 years↑
"Flying, lifelink"
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"Flying, lifelink"
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$0.35↓#5540↑0.33↓1.2 years↓
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$9.23↑#2591↑0.75↑2.9 years↓
"Whenever this card attacks, each opponent discards a card. For each opponent who can't, you draw a card."
+1 more matching line
Ghastly Gloomhunter77%
$0.12↓#14402↓0.00↓6.1 years↓
"Flying, lifelink"
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$5.10↑#2409↑0.5916.3 years↑
"Whenever an opponent discards a card, that player loses 2 life."
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"
: Whenever a card is put into an opponent's graveyard from anywhere this turn, that player loses 1 life."
: Whenever a card is put into an opponent's graveyard from anywhere this turn, that player loses 1 life."
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"Whenever one or more creature cards are put into your graveyard from anywhere, put that many +1/+1 counters on this creature."