Sharktocrab 
Creature — Shark Octopus Crab
$0.20 #14774 0.19 7.7 years
: Adapt 1. (If this creature has no +1/+1 counters on it, put a +1/+1 counter on it.)Whenever one or more +1/+1 counters are put on this creature, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
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Cards similar to Sharktocrab 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.
Fear of Immobility90%
$0.13↓#176540.252.1 years↓
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Fractal Mascot90%
$0.09↓#22254↓0.09↓0.5 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Alchemax Slayer-Bots90%
$0.19↓#18034↓0.43↑1.1 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol90%
$0.21↑#29666↓0.160.3 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Rowdy Snowballers90%
$0.10↓#138240.170.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Utrom Scientists90%
$0.06↓#21901↓0.31↑0.6 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Tranquilize89%
$0.14↓#132450.262.3 years↓
"Tap target creature an opponent controls and put three stun counters on it."
Celestial Regulator89%
$0.12↓#22266↓0.00↓4.5 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."
Procrastinate88%
$0.18↓#126780.230.5 years↓
"Tap target creature. Put twice X stun counters on it."
Stitched Mangler88%
$0.13↓#21336↓0.31↑10.5 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Watertrap Weaver88%
$0.08↓#22463↓0.39↑9.1 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Kor Hookmaster88%
$0.05↓#25885↓0.06↓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."
Frost Lynx88%
$0.04↓#20063↓0.2712.3 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Collector's Case88%
$0.25↑#26013↓0.30↑0.3 years↓
"When this artifact enters, tap up to one target creature and put two stun counters on it."
Spire Patrol88%
$0.05↓#28618↓0.04↓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."
Frost Trickster88%
$0.10↓#17862↓0.255.5 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer88%
$0.06↓#26268↓0.06↓7.7 years
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Donatello, Rad Scientist87%
$0.35↑#18700↓0.45↑0.6 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."
Rapier Wit86%
$0.16↓#152480.200.5 years↓
"Tap target creature. If it's your turn, put a stun counter on it."
Gilded Scuttler86%
$0.34↑#135670.06↓1.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."