Siren of the Silent Song 
Creature — Zombie Siren
$0.21 #18088 0.57 12.7 years
Flying
Inspired — Whenever this creature becomes untapped, each opponent discards a card, then each opponent mills a card.
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Cards similar to Siren of the Silent Song 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.
Hollowsage90%
$0.14↓#27556↓0.31↓18.5 years↑
"Whenever this creature becomes untapped, you may have target player discard a card."
Infernal Kirin82%
$2.30↑#171030.19↓21.4 years↑
"Flying"
Mesmeric Orb78%
$17.44↑#1096↑1.47↑23.0 years↑
"Whenever a permanent becomes untapped, that permanent's controller mills a card."
Cavern Whisperer76%
$0.15↓#10139↑0.27↓6.5 years↓
"Whenever this creature mutates, each opponent discards a card."
Rakshasa's Secret74%
$0.03↓#25902↓0.26↓12.1 years
"Target opponent discards two cards. You mill two cards."
Robber Fly74%
$0.32↑#28252↓0.30↓27.0 years↑
"Flying"
Caligo Skin-Witch73%
$0.11↓#24620↓0.658.5 years↓
"When this creature enters, if it was kicked, each opponent discards two cards."
Cao Cao, Lord of Wei73%
$5.12↑#22695↓0.39↓27.5 years↑
"
: Target opponent discards two cards. Activate only during your turn, before attackers are declared."
: Target opponent discards two cards. Activate only during your turn, before attackers are declared."
Liliana's Specter72%
$0.13↓#9854↑0.27↓16.3 years↑
"When this creature enters, each opponent discards a card."
Sphinx Mindbreaker72%
$3.42↑#151930.31↓6.7 years↓
"When this creature enters, each opponent mills ten cards."
Scepter of Fugue72%
$0.33↑#26309↓0.17↓17.7 years↑
", : Target player discards a card. Activate only during your turn."
, : Target player discards a card. Activate only during your turn."
Nezumi Informant71%
$0.34↑#4740↑0.32↓3.5 years↓
"When this creature enters, each opponent discards a card."
Elderfang Disciple71%
$0.16↓#4582↑0.44↓5.7 years↓
"When this creature enters, each opponent discards a card."
Hecteyes71%
$0.21#7077↑0.471.4 years↓
"When this creature enters, each opponent discards a card."
Burglar Rat71%
$0.21#2604↑0.33↓8.0 years↓
"When this creature enters, each opponent discards a card."
Cackling Fiend71%
$0.12↓#215210.29↓28.0 years↑
"When this creature enters, each opponent discards a card."
Rank Rat71%
$0.23↑#204880.36↓0.0 years↓
"When this creature enters, each opponent discards a card."
Stony-Voiced Goblins71%
$0.12↓#160690.510.2 years↓
"When this creature enters, each opponent discards a card."
Virus Beetle71%
$0.14↓#4013↑0.32↓4.7 years↓
"When this creature enters, each opponent discards a card."
Thoughtrender Lamia71%
$0.33↑#11481↑0.5012.5 years
"Whenever this creature or another enchantment you control enters, each opponent discards a card."