Psychic Symbiont 
Creature — Nightmare Horror
$0.06 #24313 0.12 8.1 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%
$8.13↑#278380.47↑29.3 years↑
"When this creature enters, you may have target opponent discard a card."
Unhinge88%
$0.10↑#279910.1224.6 years↑
"Target player discards a card."
Abyssal Horror88%
$0.48↑#244600.73↑27.9 years↑
"When this creature enters, target player discards two cards."
Screeching Buzzard88%
$0.04↓#270620.42↑23.9 years↑
"Flying"
Shrieking Specter88%
$1.01↑#30868↓0.47↑27.2 years↑
"Flying"
Ravenous Rats87%
$0.12↑#11730↑0.37↑28.2 years↑
"When this creature enters, target opponent discards a card."
Corrupt Court Official87%
$0.14↑#15922↑0.53↑27.3 years↑
"When this creature enters, target opponent discards a card."
Brutal Nightstalker86%
$0.63↑#31525↓0.53↑28.2 years↑
"When this creature enters, you may have target opponent discard a card."
Mindculling86%
$0.16↑#291580.56↑15.3 years↑
"You draw two cards and target opponent discards two cards."
Disinformation Campaign84%
$0.21↑#12691↑0.28↑7.9 years
"When this enchantment enters, you draw a card and each opponent discards a card."
Liliana's Specter84%
$0.14↑#9807↑0.60↑16.1 years↑
"When this creature enters, each opponent discards a card."
Stony-Voiced Goblins82%
$0.26↑#200090.00↓0.1 years↓
"When this creature enters, each opponent discards a card."
Hecteyes82%
$0.20↑#7595↑0.131.2 years↓
"When this creature enters, each opponent discards a card."
Nezumi Informant82%
$0.38↑#4695↑0.26↑3.4 years↓
"When this creature enters, each opponent discards a card."
Elderfang Disciple82%
$0.18↑#4589↑0.28↑5.6 years↓
"When this creature enters, each opponent discards a card."
Virus Beetle82%
$0.15↑#4046↑0.29↑4.5 years↓
"When this creature enters, each opponent discards a card."
Cackling Fiend82%
$0.15↑#212690.31↑27.9 years↑
"When this creature enters, each opponent discards a card."
Burglar Rat82%
$0.22↑#2600↑0.30↑7.9 years
"When this creature enters, each opponent discards a card."
Faerie Miscreant80%
$0.20↑#194710.38↑11.1 years↑
"Flying"
Syphon Mind80%
$0.31↑#1053↑0.51↑23.9 years↑
"Each other player discards a card. You draw a card for each card discarded this way."