Shield Broker 
Creature — Octopus Advisor
$0.23 #10688 0.63 4.5 years
When this creature enters, put a shield counter on target noncommander creature you don't control. You gain control of that creature for as long as it has a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)
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Cards similar to Shield Broker 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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"When this creature enters, gain control of target creature for as long as this creature remains on the battlefield."
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"Put a shield counter on target creature."
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"When this creature enters, gain control of target creature for as long as you control this creature."
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"When this card enters, put a shield counter on target creature."
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$0.27↑#6148↑0.17↓2.9 years↓
"When this creature enters, put a shield counter on another target creature you control."
Brokers Veteran70%
$0.18↓#22155↓0.06↓4.5 years
"When this creature dies, put a shield counter on target creature you control."
Kros, Defense Contractor70%
$0.41↑#114490.43↓4.5 years
"At the beginning of your upkeep, put a shield counter on target creature an opponent controls."