Kederekt Parasite 
Creature — Horror
$7.62 #1994 0.41 17.6 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%
$2.85↓#17050.3812.6 years↓
"Whenever an opponent draws a card, this creature deals 1 damage to that player."
Underworld Dreams94%
$2.01↓#1428↑0.66↑32.3 years↑
"Whenever an opponent draws a card, this enchantment deals 1 damage to that player."
Nekusar, the Mindrazer88%
$3.45↓#3732↓1.24↑12.8 years↓
"Whenever an opponent draws a card, this card deals 1 damage to that player."
Razorkin Needlehead88%
$5.95↓#970↑0.63↑1.9 years↓
"Whenever an opponent draws a card, this creature deals 1 damage to them."
Spiteful Visions84%
$0.57↓#22970.51↑18.3 years
"Whenever a player draws a card, this enchantment deals 1 damage to that player."
Ob Nixilis, the Hate-Twisted79%
$0.49↓#4085↓0.477.3 years↓
"Whenever an opponent draws a card, this card deals 1 damage to that player."
Fanatic of Mogis78%
$0.28↓#3794↓0.22↓12.9 years↓
"When this creature enters, it deals damage to each opponent equal to your devotion to red."
Mind's Eye70%
$0.43↓#23030.28↓22.9 years↑
"Whenever an opponent draws a card, you may pay 
. If you do, draw a card."
. If you do, draw a card."
Scrawling Crawler70%
$6.86↓#607↑0.70↑1.8 years↓
"Whenever an opponent draws a card, that player loses 1 life."
Sheoldred, the Apocalypse70%
$78.75↑#456↑2.03↑4.0 years↓
"Whenever an opponent draws a card, they lose 2 life."
Consecrated Sphinx70%
$22.91↑#665↑1.80↑15.6 years↓
"Whenever an opponent draws a card, you may draw two cards."
Lightning Cloud70%
$0.67↓#28379↓0.00↓29.6 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."
Panicked Altisaur70%
$0.18↓#13639↓0.07↓2.8 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."
Brazen Dwarf70%
$0.24↓#6155↓0.00↓5.1 years↓
"Whenever you roll one or more dice, this creature deals 1 damage to each opponent."