Psychic Symbiont 
Creature — Nightmare Horror
$0.06 #24684 0.33 8.3 years
Flying
When this creature enters, target opponent discards a card and you draw a card.
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Cards similar to Psychic Symbiont 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.
Ebon Dragon88%
$8.17↑#282450.18↓29.5 years↑
"When this creature enters, you may have target opponent discard a card."
Unhinge88%
$0.12↑#282460.56↑24.7 years↑
"Target player discards a card."
Abyssal Horror88%
$0.44↑#245720.75↑28.0 years↑
"When this creature enters, target player discards two cards."
Screeching Buzzard88%
$0.04↓#273260.11↓24.0 years↑
"Flying"
Corrupt Court Official87%
$0.13↑#15960↑0.06↓27.5 years↑
"When this creature enters, target opponent discards a card."
Ravenous Rats87%
$0.15↑#11929↑0.06↓28.3 years↑
"When this creature enters, target opponent discards a card."
Brutal Nightstalker86%
$0.63↑#31835↓0.16↓28.3 years↑
"When this creature enters, you may have target opponent discard a card."
Mindculling86%
$0.15↑#294930.3115.4 years↑
"You draw two cards and target opponent discards two cards."
Disinformation Campaign84%
$0.20↑#13015↑0.17↓8.0 years
"When this enchantment enters, you draw a card and each opponent discards a card."
Liliana's Specter84%
$0.13↑#9854↑0.2716.3 years↑
"When this creature enters, each opponent discards a card."
Nezumi Informant82%
$0.34↑#4740↑0.323.5 years↓
"When this creature enters, each opponent discards a card."
Elderfang Disciple82%
$0.16↑#4582↑0.44↑5.7 years↓
"When this creature enters, each opponent discards a card."
Hecteyes82%
$0.21↑#7077↑0.47↑1.4 years↓
"When this creature enters, each opponent discards a card."
Burglar Rat82%
$0.21↑#2604↑0.338.0 years
"When this creature enters, each opponent discards a card."
Cackling Fiend82%
$0.12↑#215210.2928.0 years↑
"When this creature enters, each opponent discards a card."
Rank Rat82%
$0.23↑#204880.360.0 years↓
"When this creature enters, each opponent discards a card."
Stony-Voiced Goblins82%
$0.12↑#16069↑0.51↑0.2 years↓
"When this creature enters, each opponent discards a card."
Virus Beetle82%
$0.14↑#4013↑0.324.7 years↓
"When this creature enters, each opponent discards a card."
Skyship Buccaneer80%
$0.11↑#225580.11↓1.9 years↓
"Flying"
Abyssal Specter80%
$0.11↑#16566↑0.2531.4 years↑
"Flying"