Thundermare 
Creature — Elemental Horse
$0.91 #19050 0.33 29.5 years
Haste (This creature can attack and 
as soon as it comes under your control.)
as soon as it comes under your control.)When this creature enters, tap all other creatures.
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Cards similar to Thundermare 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.
Shrieking Mogg100%
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"When this creature enters, tap all other creatures."
+1 more matching line
Subjugator Angel98%
$0.31↓#9439↑0.3310.2 years↓
"When this creature enters, tap all creatures your opponents control."
Tempest Caller96%
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"When this creature enters, tap all creatures target opponent controls."
Heavy Infantry93%
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"When this creature enters, tap target creature an opponent controls."
Chrome Prowler93%
$0.17↓#200540.05↓3.7 years↓
"When this creature enters, tap target creature an opponent controls."
Leonin Snarecaster92%
$0.04↓#24777↓0.07↓13.1 years↓
"When this creature enters, you may tap target creature."
Somnomancer92%
$0.13↓#30880↓0.2518.5 years↓
"When this creature enters, you may tap target creature."
Glaring Aegis92%
$0.07↓#180470.06↓11.6 years↓
"When this Aura enters, tap target creature an opponent controls."
Niblis of the Mist92%
$0.15↓#28699↓0.06↓14.7 years↓
"When this creature enters, you may tap target creature."
Intrusive Packbeast90%
$0.04↓#30067↓0.09↓8.0 years↓
"When this creature enters, tap up to two target creatures your opponents control."
Githzerai Monk89%
$0.24↓#10044↑0.254.4 years↓
"When this creature enters, tap all creatures you don't control."
Ultimecia, Temporal Threat86%
$0.53↓#7307↑0.67↑1.4 years↓
"When this card enters, tap all creatures your opponents control."
Sentinel of the Eternal Watch85%
$0.11↓#173720.44↑11.3 years↓
"At the beginning of combat on each opponent's turn, tap target creature that player controls."
Harrier Griffin84%
$0.13↓#25786↓0.18↓20.7 years↓
"At the beginning of your upkeep, tap target creature."
Frost Lynx84%
$0.04↓#200630.2712.3 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Stitched Mangler84%
$0.13↓#213360.3110.5 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Watertrap Weaver84%
$0.08↓#224630.399.1 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Kor Hookmaster84%
$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."
Alchemax Slayer-Bots84%
$0.19↓#180340.431.1 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol84%
$0.21↓#29666↓0.16↓0.3 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."