Oceanus Dragon 
Creature — Dragon
$0.15 #19018 0.06 4.4 years
Flying
When this creature enters, tap target creature an opponent controls. Goad it. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)
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Cards similar to Oceanus Dragon 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.
Niblis of the Mist88%
$0.15#28699↓0.0614.7 years↑
"When this creature enters, you may tap target creature."
Heavy Infantry86%
$0.01↓#30549↓0.0611.3 years↑
"When this creature enters, tap target creature an opponent controls."
Chrome Prowler86%
$0.17↑#200540.053.7 years
"When this creature enters, tap target creature an opponent controls."
Glaring Aegis86%
$0.07↓#180470.0611.6 years↑
"When this Aura enters, tap target creature an opponent controls."
Leonin Snarecaster86%
$0.04↓#24777↓0.0713.1 years↑
"When this creature enters, you may tap target creature."
Somnomancer86%
$0.13↓#30880↓0.25↑18.5 years↑
"When this creature enters, you may tap target creature."
Jeering Homunculus86%
$0.12↓#192760.1110.1 years↑
"When this creature enters, you may goad target creature."
Tempest Caller85%
$0.24↑#9708↑0.38↑9.1 years↑
"When this creature enters, tap all creatures target opponent controls."
Insufferable Balladeer85%
$0.16↑#13557↑0.124.4 years
"When this creature enters, target creature an opponent controls can't block this turn. Goad it."
Subjugator Angel83%
$0.31↑#9439↑0.33↑10.2 years↑
"When this creature enters, tap all creatures your opponents control."
Harrier Griffin80%
$0.13↓#25786↓0.18↑20.7 years↑
"At the beginning of your upkeep, tap target creature."
Intrusive Packbeast80%
$0.04↓#30067↓0.098.0 years↑
"When this creature enters, tap up to two target creatures your opponents control."
Thundermare78%
$0.91↑#190500.33↑29.5 years↑
"When this creature enters, tap all other creatures."
Shrieking Mogg78%
$0.54↑#25468↓0.37↑26.7 years↑
"When this creature enters, tap all other creatures."
Spire Patrol78%
$0.05↓#28618↓0.049.7 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Trickster78%
$0.10↓#178620.25↑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."
Chillbringer78%
$0.06↓#26268↓0.067.7 years↑
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Topplegeist76%
$0.22↑#9751↑0.1410.6 years↑
"When this creature enters, tap target creature an opponent controls."
+1 more matching line
Stitched Mangler76%
$0.13↓#213360.31↑10.5 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Watertrap Weaver76%
$0.08↓#224630.39↑9.1 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."