Tempest Caller 
Creature — Merfolk Wizard
$0.24 #9708 0.38 9.1 years
When this creature enters, tap all creatures target opponent controls.
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Cards similar to Tempest Caller 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.
Heavy Infantry98%
$0.01↓#30549↓0.06↓11.3 years↑
"When this creature enters, tap target creature an opponent controls."
Chrome Prowler98%
$0.17↓#20054↓0.05↓3.7 years↓
"When this creature enters, tap target creature an opponent controls."
Glaring Aegis97%
$0.07↓#18047↓0.06↓11.6 years↑
"When this Aura enters, tap target creature an opponent controls."
Leonin Snarecaster97%
$0.04↓#24777↓0.07↓13.1 years↑
"When this creature enters, you may tap target creature."
Somnomancer97%
$0.13↓#30880↓0.25↓18.5 years↑
"When this creature enters, you may tap target creature."
Subjugator Angel96%
$0.31↑#94390.3310.2 years↑
"When this creature enters, tap all creatures your opponents control."
Thundermare96%
$0.91↑#19050↓0.3329.5 years↑
"When this creature enters, tap all other creatures."
Shrieking Mogg96%
$0.54↑#25468↓0.3726.7 years↑
"When this creature enters, tap all other creatures."
Niblis of the Mist96%
$0.15↓#28699↓0.06↓14.7 years↑
"When this creature enters, you may tap target creature."
Intrusive Packbeast94%
$0.04↓#30067↓0.09↓8.0 years↓
"When this creature enters, tap up to two target creatures your opponents control."
Sentinel of the Eternal Watch92%
$0.11↓#17372↓0.4411.3 years↑
"At the beginning of combat on each opponent's turn, tap target creature that player controls."
Harrier Griffin90%
$0.13↓#25786↓0.18↓20.7 years↑
"At the beginning of your upkeep, tap target creature."
Frost Lynx89%
$0.04↓#20063↓0.27↓12.3 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Stitched Mangler89%
$0.13↓#21336↓0.3110.5 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Watertrap Weaver89%
$0.08↓#22463↓0.399.1 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Kor Hookmaster89%
$0.05↓#25885↓0.06↓17.0 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer88%
$0.06↓#26268↓0.06↓7.7 years↓
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Frost Trickster88%
$0.10↓#17862↓0.25↓5.5 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Spire Patrol88%
$0.05↓#28618↓0.04↓9.7 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Alchemax Slayer-Bots88%
$0.19↓#18034↓0.431.1 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."