Coral Trickster 
Creature — Merfolk Rogue
$0.04 #22568 0.00 19.9 years
Morph (You may cast this card face down as a 2/2 creature for 
. Turn it face up any time for its morph cost.)
(You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)When this creature is turned face up, you may tap or untap target permanent.
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Cards similar to Coral Trickster 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.
Pestermite92%
$0.25↑#10822↑0.50↑18.9 years↓
"When this creature enters, you may tap or untap target permanent."
Tidal Force90%
$0.51↑#16715↑0.13↑12.8 years↓
"At the beginning of each upkeep, you may tap or untap target permanent."
Psychic Puppetry88%
$0.37↑#184610.0021.9 years↑
"You may tap or untap target permanent."
Captain of the Mists87%
$0.18↑#197870.36↑14.3 years↓
", 
: You may tap or untap target permanent."
, : You may tap or untap target permanent."
Toils of Night and Day86%
$0.17↑#181880.10↑21.6 years↑
"You may tap or untap target permanent, then you may tap or untap another target permanent."
Esper Sojourners84%
$0.08↑#257500.0717.3 years↓
"When you cycle this card and when this creature dies, you may tap or untap target permanent."
Fatestitcher84%
$0.52↑#6396↑0.29↑17.9 years↓
": You may tap or untap another target permanent."
: You may tap or untap another target permanent."
Rimewind Taskmage84%
$0.20↑#182670.0620.1 years
", : You may tap or untap target permanent. Activate only if you control four or more snow permanents."
, : You may tap or untap target permanent. Activate only if you control four or more snow permanents."
Gandalf the Grey83%
$0.44↑#7435↑0.23↑3.2 years↓
"• You may tap or untap target permanent."
Telekinetic Bonds82%
$0.32↑#28625↓0.27↑24.3 years↑
"Whenever a player discards a card, you may pay . If you do, you may tap or untap target permanent."
. If you do, you may tap or untap target permanent."
Dream's Grip82%
$0.38↑#9301↑0.20↑22.9 years↑
"• Untap target permanent."
Deceiver Exarch82%
$0.17↑#13719↑0.50↑15.3 years↓
"• Untap target permanent you control."
Granite Witness82%
$0.06↑#246410.43↑2.6 years↓
"When this creature is turned face up, you may tap or untap target creature."
+1 more matching line
Ral Zarek82%
$0.70↑#6065↑0.59↑13.3 years↓
"+1: Tap target permanent, then untap another target permanent."
Proteus Machine82%
$0.28↑#17594↑0.0023.3 years↑
"Morph 
You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost."
You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost."
Hidden Strings82%
$0.29↑#4193↑0.33↑13.3 years↓
"You may tap or untap target permanent, then you may tap or untap another target permanent."
Kelpie Guide82%
$0.23↑#4655↑0.17↑5.4 years↓
": Untap another target permanent you control."
: Untap another target permanent you control."
Efreet Weaponmaster82%
$0.04#30925↓0.40↑11.9 years↓
"Morph 
You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost."
You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost."
Derevi, Empyrial Tactician81%
$5.43↑#2907↑1.42↑12.8 years↓
"When this card enters and whenever a creature you control deals combat damage to a player, you may tap or untap target permanent."
Skinthinner80%
$0.09↑#16134↑0.0623.6 years↑
"Morph 
You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost."
You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost."