Tempest Caller 
Creature — Merfolk Wizard
$0.26 #9488 0.47 8.9 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.
Chrome Prowler98%
$0.17↓#19748↓0.12↓3.6 years↓
"When this creature enters, tap target creature an opponent controls."
Heavy Infantry98%
$0.01↓#30138↓0.29↓11.1 years↑
"When this creature enters, tap target creature an opponent controls."
Glaring Aegis97%
$0.07↓#17739↓0.00↓11.4 years↑
"When this Aura enters, tap target creature an opponent controls."
Leonin Snarecaster97%
$0.05↓#24501↓0.06↓12.9 years↑
"When this creature enters, you may tap target creature."
Somnomancer97%
$0.13↓#30581↓0.00↓18.3 years↑
"When this creature enters, you may tap target creature."
Subjugator Angel96%
$0.30↑#95070.62↑10.1 years↑
"When this creature enters, tap all creatures your opponents control."
Thundermare96%
$0.89↑#18811↓0.14↓29.3 years↑
"When this creature enters, tap all other creatures."
Shrieking Mogg96%
$0.52↑#25118↓0.88↑26.6 years↑
"When this creature enters, tap all other creatures."
Niblis of the Mist96%
$0.18↓#28236↓0.33↓14.6 years↑
"When this creature enters, you may tap target creature."
Intrusive Packbeast94%
$0.03↓#29797↓0.00↓7.9 years↓
"When this creature enters, tap up to two target creatures your opponents control."
Sentinel of the Eternal Watch92%
$0.12↓#16982↓0.06↓11.1 years↑
"At the beginning of combat on each opponent's turn, tap target creature that player controls."
Harrier Griffin90%
$0.12↓#25434↓0.33↓20.6 years↑
"At the beginning of your upkeep, tap target creature."
Stitched Mangler89%
$0.11↓#21062↓0.18↓10.4 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↓#25606↓0.13↓16.9 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%
$0.06↓#22206↓0.538.9 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Lynx89%
$0.04↓#19763↓0.4112.1 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer88%
$0.05↓#26013↓0.06↓7.6 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↓#17571↓0.11↓5.4 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%
$0.21↓#28315↓0.18↓9.6 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Rowdy Snowballers88%
$0.17↓#13993↓0.00↓0.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."