Breaching Leviathan 
Creature — Leviathan
$7.42 #10236 0.37 11.9 years
When this creature enters, if you cast it from your hand, tap all nonblue creatures. Those creatures don't untap during their controllers' next untap steps.
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Cards similar to Breaching Leviathan 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.
Chillbringer84%
$0.06↓#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."
Kor Hookmaster84%
$0.05↓#25626↓0.13↓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."
Watertrap Weaver84%
$0.06↓#22249↓0.53↑9.0 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Lynx84%
$0.04↓#19818↓0.4112.2 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%
$0.11↓#21118↓0.18↓10.4 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Trickster84%
$0.10↓#17565↓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."
Spire Patrol84%
$0.19↓#28349↓0.18↓9.7 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%
$0.22↓#18119↓0.17↓1.0 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol84%
$0.19↓#30043↓0.00↓0.2 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Rowdy Snowballers84%
$0.14↓#13946↓0.00↓0.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fractal Mascot84%
$0.12↓#22486↓0.00↓0.4 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Referee Squad83%
$0.12↓#19218↓0.283.4 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Utrom Scientists82%
$0.09↓#22081↓0.00↓0.5 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Fear of Immobility82%
$0.12↓#17112↓0.18↓2.0 years↓
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Donatello, Rad Scientist81%
$0.34↓#18934↓0.00↓0.5 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."
Gilded Scuttler80%
$0.26↓#13874↓0.15↓1.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Collector's Case80%
$0.17↓#27020↓0.00↓0.2 years↓
"When this artifact enters, tap up to one target creature and put two stun counters on it."
Take into Custody80%
$0.05↓#23583↓0.279.7 years↓
"Tap target creature. It doesn't untap during its controller's next untap step."
Celestial Regulator80%
$0.15↓#21996↓0.14↓4.4 years↓
"When this creature enters, choose target creature you don't control and tap it. If you control a creature with a counter on it, the chosen creature doesn't untap during its controller's next untap step."
Press for Answers80%
$0.06↓#20261↓0.11↓10.4 years↓
"Tap target creature. It doesn't untap during its controller's next untap step."