Topplegeist 
Creature — Spirit
$0.20 #9550 0.62 10.5 years
Flying
When this creature enters, tap target creature an opponent controls.
Delirium — At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, tap target creature that player controls.
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Cards similar to Topplegeist 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%
$0.18↓#28236↓0.33↓14.6 years↑
"When this creature enters, you may tap target creature."
Chrome Prowler87%
$0.17↓#19748↓0.12↓3.6 years↓
"When this creature enters, tap target creature an opponent controls."
Heavy Infantry87%
$0.01↓#30138↓0.29↓11.1 years
"When this creature enters, tap target creature an opponent controls."
Leonin Snarecaster86%
$0.05↓#24501↓0.06↓12.9 years↑
"When this creature enters, you may tap target creature."
Somnomancer86%
$0.13↓#30581↓0.00↓18.3 years↑
"When this creature enters, you may tap target creature."
Glaring Aegis86%
$0.07↓#17739↓0.00↓11.4 years
"When this Aura enters, tap target creature an opponent controls."
Tempest Caller85%
$0.26↑#94880.47↓8.9 years↓
"When this creature enters, tap all creatures target opponent controls."
Harrier Griffin85%
$0.12↓#25434↓0.33↓20.6 years↑
"At the beginning of your upkeep, tap target creature."
Obsessive Skinner84%
$0.18↓#14106↓0.21↓10.4 years
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, put a +1/+1 counter on target creature."
+1 more matching line
Subjugator Angel84%
$0.30↑#95070.6210.1 years
"When this creature enters, tap all creatures your opponents control."
Tooth Collector82%
$0.05↓#25459↓0.47↓10.5 years
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, target creature that player controls gets -1/-1 until end of turn."
Sentinel of the Eternal Watch82%
$0.12↓#16982↓0.06↓11.1 years
"At the beginning of combat on each opponent's turn, tap target creature that player controls."
Intrusive Packbeast81%
$0.03↓#29797↓0.00↓7.9 years↓
"When this creature enters, tap up to two target creatures your opponents control."
Squall Drifter80%
$0.20#15873↓0.08↓20.1 years↑
", 
: Tap target creature."
, : Tap target creature."
Cemetery Illuminator80%
$0.55↑#11937↓0.27↓4.8 years↓
"Flying"
Thundermare80%
$0.89↑#18811↓0.14↓29.3 years↑
"When this creature enters, tap all other creatures."
Shrieking Mogg80%
$0.52↑#25118↓0.88↑26.6 years↑
"When this creature enters, tap all other creatures."
Manic Scribe80%
$0.34↑#100430.00↓10.4 years
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, that player mills three cards."
Chillbringer80%
$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 Trickster80%
$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."