Quest for the Nihil Stone 
Enchantment
$1.69 #10408 0.29 16.6 years
Whenever an opponent discards a card, you may put a quest counter on this enchantment.
At the beginning of each opponent's upkeep, if that player has no cards in hand and this enchantment has two or more quest counters on it, you may have that player lose 5 life.
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Cards similar to Quest for the Nihil Stone 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.
Hollowborn Barghest92%
$0.27↓#26553↓0.58↑18.3 years↑
"At the beginning of each opponent's upkeep, if that player has no cards in hand, they lose 2 life."
Shrieking Affliction87%
$0.32↓#111870.50↑13.9 years↓
"At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, they lose 3 life."
Tinybones, Trinket Thief87%
$4.28↑#5111↑1.10↑6.1 years↓
"

: Each opponent with no cards in hand loses 10 life."
Bloodchief Ascension84%
$14.21↑#752↑1.14↑16.9 years
"At the beginning of each end step, if an opponent lost 2 or more life this turn, you may put a quest counter on this enchantment."
+1 more matching line
Nezumi Shortfang // Stabwhisker the Odious81%
$2.19↑#16336↓0.2721.9 years↑
"At the beginning of each opponent's upkeep, that player loses 1 life for each card fewer than three in their hand."
+1 more matching line
Bandit's Talent80%
$0.41↓#4214↑0.55↑2.1 years↓
"At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, they lose 2 life."
Lavaborn Muse78%
$0.17↓#22627↓0.3523.6 years↑
"At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this creature deals 3 damage to that player."
Luminarch Ascension77%
$11.94↑#3298↑0.62↑16.9 years
"At the beginning of each opponent's end step, if you didn't lose life this turn, you may put a quest counter on this enchantment."
Hellfire Mongrel76%
$0.12↓#22696↓0.3316.9 years
"At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this creature deals 2 damage to that player."
Paupers' Cage76%
$1.35↓#24679↓0.12↓29.9 years↑
"At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this artifact deals 2 damage to that player."
Rackling76%
$0.22↓#23322↓0.00↓26.6 years↑
"At the beginning of each opponent's upkeep, this creature deals X damage to that player, where X is 3 minus the number of cards in their hand."
Wheel of Torture76%
$1.01↓#17240↓0.06↓27.6 years↑
"At the beginning of each opponent's upkeep, this artifact deals X damage to that player, where X is 3 minus the number of cards in their hand."
Liliana's Caress74%
$5.31↑#2412↑0.51↑16.1 years
"Whenever an opponent discards a card, that player loses 2 life."
Storm World73%
$44.70↑#26198↓0.3332.3 years↑
"At the beginning of each player's upkeep, this enchantment deals X damage to that player, where X is 4 minus the number of cards in their hand."
Tourach, Dread Cantor72%
$0.47↓#6178↑0.56↑5.3 years↓
"Whenever an opponent discards a card, put a +1/+1 counter on this card."
Davriel, Rogue Shadowmage72%
$0.23↓#117780.11↓7.3 years↓
"At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, this card deals 2 damage to them."
+1 more matching line
Fell Specter72%
$0.34↓#4878↑0.41↑8.1 years↓
"Whenever an opponent discards a card, that player loses 2 life."
Entropic Battlecruiser71%
$0.30↓#5850↑0.311.1 years↓
"Whenever an opponent discards a card, they lose 3 life."
+1 more matching line
Skullcage71%
$0.36↓#17380↓0.2122.3 years↑
"At the beginning of each opponent's upkeep, this artifact deals 2 damage to that player unless they have exactly three or exactly four cards in hand."