Mercurial Kite 
Creature — Bird
$0.04 #30813 0.43 23.3 years
Flying
Whenever this creature deals combat damage to a creature, tap that creature. That creature doesn't untap during its controller's next untap step.
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Cards similar to Mercurial Kite 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.
Orochi Ranger100%
$0.07↑#264320.4421.9 years↓
"Whenever this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step."
Kashi-Tribe Warriors100%
$0.19↑#284200.10↓21.9 years↓
"Whenever this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step."
Kashi-Tribe Reaver98%
$0.18↑#254580.4221.9 years↓
"Whenever this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step."
Queen of Ice // Rage of Winter98%
$0.12↑#13282↑0.79↑6.9 years↓
"Whenever this creature deals combat damage to a creature, tap that creature. It doesn't untap during its controller's next untap step."
Matsu-Tribe Decoy96%
$0.07↑#265260.4021.9 years↓
"Whenever this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step."
Matsu-Tribe Birdstalker96%
$0.10↑#271500.00↓21.3 years↓
"Whenever this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step."
Matsu-Tribe Sniper94%
$0.11↑#17917↑0.61↑21.6 years↓
"Whenever this creature deals damage to a creature, tap that creature and it doesn't untap during its controller's next untap step."
Frostwalk Bastion93%
$0.24↑#10310↑0.13↓7.2 years↓
"Whenever this land deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step."
Kashi-Tribe Elite89%
$0.33↑#18855↑0.3321.3 years↓
"Whenever this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step."
Chillbringer84%
$0.05↑#260130.06↓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 Trickster84%
$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."
Spire Patrol84%
$0.21↑#283150.18↓9.6 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↑#21062↑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."
Kor Hookmaster84%
$0.05↑#256060.13↓16.9 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↑#22206↑0.53↑8.9 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#19763↑0.4112.1 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Shipwreck Patrol81%
$0.17↑#302330.00↓0.2 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots81%
$0.22↑#18129↑0.17↓0.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Rowdy Snowballers81%
$0.17↑#13993↑0.00↓0.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fractal Mascot81%
$0.13↑#22595↑0.00↓0.4 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."