Sharktocrab 
Creature — Shark Octopus Crab
$0.17 #14586 0.36 7.6 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%
$0.11↓#170420.18↓1.9 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%
$0.13↓#22595↓0.00↓0.4 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Shipwreck Patrol90%
$0.17#30233↓0.00↓0.2 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots90%
$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 Snowballers90%
$0.17#139930.00↓0.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Utrom Scientists90%
$0.13↓#22162↓0.00↓0.5 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Tranquilize89%
$0.17#130610.57↑2.2 years↓
"Tap target creature an opponent controls and put three stun counters on it."
Celestial Regulator89%
$0.16↓#21942↓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."
Procrastinate88%
$0.20↑#134000.00↓0.4 years↓
"Tap target creature. Put twice X stun counters on it."
Watertrap Weaver88%
$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 Lynx88%
$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."
Stitched Mangler88%
$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 Hookmaster88%
$0.05↓#25606↓0.13↓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."
Collector's Case88%
$0.16↓#27215↓0.00↓0.2 years↓
"When this artifact enters, tap up to one target creature and put two stun counters on it."
Frost Trickster88%
$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 Patrol88%
$0.21↑#28315↓0.18↓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."
Chillbringer88%
$0.05↓#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."
Donatello, Rad Scientist87%
$0.38↑#18960↓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."
Rapier Wit86%
$0.20↑#160690.00↓0.4 years↓
"Tap target creature. If it's your turn, put a stun counter on it."
Gilded Scuttler86%
$0.26↑#140550.15↓1.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."