Kederekt Parasite 
Creature — Horror
$8.39 #2086 0.40 17.7 years
Whenever an opponent draws a card, if you control a red permanent, you may have this creature deal 1 damage to that player.
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Cards similar to Kederekt Parasite 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.
Fate Unraveler94%
$2.83↓#17870.56↑12.7 years↓
"Whenever an opponent draws a card, this creature deals 1 damage to that player."
Underworld Dreams94%
$1.77↓#1489↑0.72↑32.4 years↑
"Whenever an opponent draws a card, this enchantment deals 1 damage to that player."
Nekusar, the Mindrazer88%
$3.21↓#3797↓1.42↑13.0 years↓
"Whenever an opponent draws a card, this card deals 1 damage to that player."
Razorkin Needlehead88%
$5.15↓#1006↑0.71↑2.1 years↓
"Whenever an opponent draws a card, this creature deals 1 damage to them."
Spiteful Visions84%
$1.04↓#24010.58↑18.5 years
"Whenever a player draws a card, this enchantment deals 1 damage to that player."
Ob Nixilis, the Hate-Twisted79%
$0.49↓#4225↓0.397.5 years↓
"Whenever an opponent draws a card, this card deals 1 damage to that player."
Fanatic of Mogis79%
$0.26↓#3880↓0.04↓13.1 years↓
"When this creature enters, it deals damage to each opponent equal to your devotion to red."
Mind's Eye70%
$0.32↓#22130.3123.0 years↑
"Whenever an opponent draws a card, you may pay 
. If you do, draw a card."
. If you do, draw a card."
Scrawling Crawler70%
$3.21↓#586↑0.86↑1.9 years↓
"Whenever an opponent draws a card, that player loses 1 life."
Sheoldred, the Apocalypse70%
$82.13↑#460↑2.28↑4.1 years↓
"Whenever an opponent draws a card, they lose 2 life."
Consecrated Sphinx70%
$25.11↑#653↑1.82↑15.7 years↓
"Whenever an opponent draws a card, you may draw two cards."
Lightning Cloud70%
$0.64↓#28669↓0.06↓29.7 years↑
"Whenever a player casts a red spell, you may pay 
. If you do, this enchantment deals 1 damage to any target."
. If you do, this enchantment deals 1 damage to any target."
Brazen Dwarf70%
$0.24↓#6272↓0.00↓5.2 years↓
"Whenever you roll one or more dice, this creature deals 1 damage to each opponent."
Panicked Altisaur70%
$0.16↓#14077↓0.332.9 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."