Sword of the Squeak 
Artifact — Equipment
$0.58 #4087 0.50 2.1 years
Equipped creature gets +1/+1 for each creature you control with base power or toughness 1.
Whenever a Hamster, Mouse, Rat, or Squirrel you control enters, you may attach this Equipment to that creature.
Equip
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Cards similar to Sword of the Squeak 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.
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"Whenever a creature you control enters, attach this Equipment to that creature."
+1 more matching line
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"Whenever a creature you control enters, you may attach this Equipment to it."
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$0.28↓#15567↓0.20↓14.3 years↑
"Whenever a creature you control enters, you may attach this Equipment to it."
+2 more matching lines