Quagnoth 
Creature — Beast
$0.27 #30560 0.29 19.3 years
Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Shroud (This creature can't be the target of spells or abilities.)
When a spell or ability an opponent controls causes you to discard this card, return it to your hand.
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Cards similar to Quagnoth 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.
Blurred Mongoose96%
$0.58↑#302780.11↓25.9 years↑
"Shroud"
Sudden Death88%
$0.13↓#18552↑0.06↓19.9 years
"Split second"
Sudden Edict87%
$0.22↓#9695↑1.31↑5.2 years↓
"Split second"
Loxodon Smiter85%
$0.21↓#23103↑0.2713.9 years↓
"If a spell or ability an opponent controls causes you to discard this card, put it onto the battlefield instead of putting it into your graveyard."
Sudden Shock83%
$0.12↓#13980↑0.07↓19.9 years
"Split second"
Krosan Grip82%
$0.78↑#641↑0.40↑19.9 years
"Split second"
Sudden Spoiling82%
$6.26↑#2075↑0.55↑19.9 years
"Split second"
V.A.T.S.82%
$1.43↑#4507↑0.42↑2.5 years↓
"Split second"
Take Possession82%
$0.27#20910↑0.91↑19.3 years
"Split second"
Celestial Crusader82%
$0.12↓#15852↑0.13↓19.9 years
"Split second"
Pure Intentions81%
$0.31↑#284240.00↓21.3 years↑
"Whenever a spell or ability an opponent controls causes you to discard cards this turn, return those cards from your graveyard to your hand."
Wipe Away81%
$0.32↑#15072↑0.56↑19.9 years
"Split second"
Siege Smash80%
$0.29↑#3119↑0.07↓2.2 years↓
"Split second"
Stonewood Invocation80%
$1.11↑#17347↑0.00↓19.9 years
"Split second"
Trickbind80%
$9.21↑#6494↑0.14↓19.9 years
"Split second"
Extirpate79%
$0.89↑#22176↑0.2219.6 years
"Split second"
Sulfur Elemental79%
$0.11↓#303010.18↓19.6 years
"Split second"
Inventory Management79%
$3.32↑#3364↑0.382.5 years↓
"Split second"
Legolas's Quick Reflexes78%
$48.18↑#1445↑0.78↑2.8 years↓
"Split second"
Spiritual Focus78%
$6.48↑#293470.2226.9 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."