Donatello, Rad Scientist 
Legendary Creature — Mutant Ninja Turtle
$0.35 #18700 0.45 0.6 years
Vigilance (Attacking doesn't cause this creature to tap.)
When Donatello enters, tap up to three target creatures your opponents control. Put a stun counter on each of them. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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Cards similar to Donatello, Rad Scientist 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.
Utrom Scientists97%
$0.06↓#219010.31↓0.6 years
"When this creature enters, tap up to one target creature and put a stun counter on it."
Rowdy Snowballers97%
$0.10↓#13824↑0.17↓0.9 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots97%
$0.19↓#180340.431.1 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol97%
$0.21↓#29666↓0.16↓0.3 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fractal Mascot97%
$0.09↓#222540.09↓0.5 years
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Fear of Immobility97%
$0.13↓#176540.25↓2.1 years↑
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Succumb to the Cold96%
$0.28↓#10746↑0.533.1 years↑
"Tap one or two target creatures an opponent controls. Put a stun counter on each of them."
Gilded Scuttler94%
$0.34↓#13567↑0.06↓1.9 years↑
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Collector's Case94%
$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."
Tranquilize94%
$0.14↓#13245↑0.26↓2.3 years↑
"Tap target creature an opponent controls and put three stun counters on it."
Constrictor Sage93%
$0.11↓#215290.06↓1.5 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Chillbringer93%
$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."
Stitched Mangler93%
$0.13↓#213360.31↓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 Weaver93%
$0.08↓#22463↓0.399.1 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Kor Hookmaster93%
$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 Lynx93%
$0.04↓#200630.27↓12.3 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Solitary Sanctuary92%
$0.30↓#8508↑0.29↓3.1 years↑
"When this enchantment enters, tap target creature an opponent controls and put a stun counter on it."
Procrastinate92%
$0.18↓#12678↑0.23↓0.5 years
"Tap target creature. Put twice X stun counters on it."
Dreamdew Entrancer92%
$0.33↓#7051↑0.06↓2.2 years↑
"When this creature enters, tap up to one target creature and put three stun counters on it. If you control that creature, draw two cards."
Spire Patrol92%
$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."