Breaching Hippocamp 
Creature — Horse Fish
$0.06 #14892 0.12 13.1 years
Flash (You may cast this spell any time you could cast an instant.)
When this creature enters, untap another target creature you control.
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Cards similar to Breaching Hippocamp 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.
Sparring Mummy98%
$0.05↓#18737↓0.109.5 years↓
"When this creature enters, untap target creature."
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"When this creature enters, untap target creature."
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"When this creature enters, untap all creatures you control."
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"Untap target creature."
Silken Strength86%
$0.15↑#177770.061.7 years↓
"Flash"
Zephyr Winder86%
$0.19↑#25342↓0.063.5 years↓
"Whenever this creature deals combat damage to a player, untap up to one target creature."
Corridor Monitor85%
$0.10↑#9079↑0.157.0 years↓
"When this creature enters, untap target artifact or creature you control."
Jandor's Saddlebags84%
$0.59↑#162770.22↑32.8 years↑
", 
: Untap target creature."
, : Untap target creature."
Veteran's Reflexes84%
$0.21↑#22641↓0.1216.7 years↑
"Target creature gets +1/+1 until end of turn. Untap that creature."
Inspirit84%
$0.10↑#28504↓0.00↓24.0 years↑
"Untap target creature. It gets +2/+4 until end of turn."
Tenth District Veteran83%
$0.05↓#25592↓0.00↓7.7 years↓
"Whenever this creature attacks, untap another target creature you control."
Refuse to Yield83%
$0.12↑#121130.124.5 years↓
"Target creature gets +2/+7 until end of turn. Untap it."
Flash Thompson, Spider-Fan83%
$0.17↑#11653↑0.31↑1.1 years↓
"Flash"
Super Suit82%
$0.11↑#18149↓0.190.3 years↓
"When this Equipment enters, attach it to target creature you control. Untap that creature."
+1 more matching line
Guac & Marshmallow Pizza82%
$0.24↑#148230.35↑0.6 years↓
"When this artifact enters, target creature gets +2/+2 until end of turn. Untap it."
Dauntless Aven82%
$0.21↑#21086↓0.069.3 years↓
"Whenever this creature attacks, untap target creature you control."
Deepway Navigator82%
$0.18↑#18076↓0.170.7 years↓
"Flash"
Stony Strength82%
$0.12↑#135770.00↓7.7 years↓
"Put a +1/+1 counter on target creature you control. Untap that creature."
Triceraton Regenta82%
$0.23↑#30216↓0.150.6 years↓
"Whenever this creature attacks, untap up to one other target creature."
Bounding Krasis82%
$0.14↑#18079↓0.28↑11.3 years↓
"When this creature enters, you may tap or untap target creature."
+1 more matching line